Drop python 2.7 support and testing

OpenStack is dropping the py2.7 support in ussuri cycle.

metalsmith is ready with python 3 and ok to drop the
python 2.7 support.

Complete discussion & schedule can be found in
- http://lists.openstack.org/pipermail/openstack-discuss/2019-October/010142.html
- https://etherpad.openstack.org/p/drop-python2-support

Ussuri Communtiy-wide goal - https://review.opendev.org/#/c/691178/

Change-Id: Icf19488a3f230084faaf2ab5ece626b03495592e

.zuul.yaml

@@ -112,6 +112,7 @@
       centos_kernel_file: ~/CentOS-7-x86_64-GenericCloud.kernel
       centos_partition_file: ~/CentOS-7-x86_64-GenericCloud-root.qcow2
       metalsmith_root_size: 9
+      metalsmith_python: python3
 
 - job:
     name: metalsmith-integration-glance-localboot-centos7
@@ -130,16 +131,13 @@
       metalsmith_traits: [CUSTOM_GOLD]
 
 - job:
-    name: metalsmith-integration-glance-netboot-cirros-iscsi-py3
+    name: metalsmith-integration-glance-netboot-cirros-iscsi
     description: |
         Integration job using Glance as image source and CirrOS with netboot.
     parent: metalsmith-integration-base
     vars:
-      devstack_localrc:
-        USE_PYTHON3: true
       metalsmith_netboot: true
       metalsmith_precreate_port: true
-      metalsmith_python: python3
 
 - job:
     name: metalsmith-integration-glance-netboot-cirros-direct
@@ -154,7 +152,7 @@
         IRONIC_DEFAULT_DEPLOY_INTERFACE: direct
 
 - job:
-    name: metalsmith-integration-http-netboot-cirros-direct-py3
+    name: metalsmith-integration-http-netboot-cirros-direct
     description: |
         Integration job using HTTP as image source and direct deploy.
     parent: metalsmith-integration-base
@@ -162,16 +160,13 @@
     vars:
       metalsmith_netboot: true
       metalsmith_precreate_port: true
-      metalsmith_python: python3
       metalsmith_use_http: true
       devstack_localrc:
         IRONIC_DEFAULT_DEPLOY_INTERFACE: direct
-        USE_PYTHON3: true
 
 - project:
     templates:
       - check-requirements
-      - openstack-python-jobs
       - openstack-python3-ussuri-jobs
       - openstack-lower-constraints-jobs
       - openstack-cover-jobs
@@ -180,12 +175,12 @@
     check:
       jobs:
         - metalsmith-integration-glance-localboot-centos7
-        - metalsmith-integration-glance-netboot-cirros-iscsi-py3
+        - metalsmith-integration-glance-netboot-cirros-iscsi
         - metalsmith-integration-glance-netboot-cirros-direct
-        - metalsmith-integration-http-netboot-cirros-direct-py3
+        - metalsmith-integration-http-netboot-cirros-direct
     gate:
       jobs:
         - metalsmith-integration-glance-localboot-centos7
-        - metalsmith-integration-glance-netboot-cirros-iscsi-py3
+        - metalsmith-integration-glance-netboot-cirros-iscsi
         - metalsmith-integration-glance-netboot-cirros-direct
-        - metalsmith-integration-http-netboot-cirros-direct-py3
+        - metalsmith-integration-http-netboot-cirros-direct

doc/requirements.txt

@@ -2,7 +2,6 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7'  # BSD
 sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4'  # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD

releasenotes/notes/drop-py-2-7-3cd57c85e8eb8d2d.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Python 2.7 support has been dropped. Last release of metalsmith to support
+    Python 2.7 is OpenStack Train. The minimum version of Python now supported
+    by metalsmith is Python 3.6.

requirements.txt

@@ -5,5 +5,4 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 openstacksdk>=0.29.0 # Apache-2.0
 requests>=2.18.4 # Apache-2.0
 six>=1.10.0 # MIT
-enum34>=1.0.4;python_version=='2.7' or python_version=='2.6' or python_version=='3.3' # BSD
 PrettyTable<0.8,>=0.7.2 # BSD

setup.cfg

@@ -14,8 +14,6 @@ classifier =
     License :: OSI Approved :: Apache Software License
     Operating System :: OS Independent
     Programming Language :: Python
-    Programming Language :: Python :: 2
-    Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7

tox.ini

@@ -1,7 +1,8 @@
 [tox]
-envlist = py3,py27,pep8
+envlist = py3,pep8
 
 [testenv]
+basepython = python3
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
          LANGUAGE=en_US
@@ -17,7 +18,6 @@ commands =
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:cover]
-basepython = python3
 setenv = {[testenv]setenv}
          PYTHON=coverage run --branch --source metalsmith --parallel-mode
 commands =
@@ -29,7 +29,6 @@ commands =
   coverage xml -o cover/coverage.xml
 
 [testenv:venv]
-basepython = python3
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
     -r{toxinidir}/requirements.txt
@@ -41,13 +40,11 @@ passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY \
           OS_USER_DOMAIN_NAME OS_PROJECT_DOMAIN_NAME OS_CLOUD OS_CACERT
 
 [testenv:pep8]
-basepython = python3
 commands =
     flake8 metalsmith
     doc8 README.rst doc/source roles
 
 [testenv:docs]
-basepython = python3
 deps =
     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
     -r{toxinidir}/doc/joined-requirements.txt
@@ -55,7 +52,6 @@ commands =
   sphinx-build -a -E -W -b html doc/source doc/build/html
 
 [testenv:pdf-docs]
-basepython = python3
 whitelist_externals = make
 deps = {[testenv:docs]deps}
 commands =
@@ -63,7 +59,6 @@ commands =
   make -C doc/build/pdf
 
 [testenv:releasenotes]
-basepython = python3
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
   -r{toxinidir}/doc/joined-requirements.txt
@@ -71,7 +66,6 @@ commands =
   sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:lower-constraints]
-basepython = python3
 deps =
   -c{toxinidir}/lower-constraints.txt
   -r{toxinidir}/test-requirements.txt