Follow the new PTI for document build

For compliance with the Project Testing Interface as described in:
https://governance.openstack.org/tc/reference/project-testing-interface.html

For more details information, please refer to:
http://lists.openstack.org/pipermail/openstack-dev/2017-December/125710.html

Change-Id: Iec12cf7d3d9a84ff6ef4550d8453e822e80bc3c7

doc/requirements.txt

@@ -0,0 +1,3 @@
+sphinx!=1.6.6,!=1.6.7,>=1.6.5 # BSD
+openstackdocstheme>=1.18.1 # Apache-2.0
+reno>=2.5.0 # Apache-2.0

doc/source/docker_install.rst

@@ -1,3 +1,7 @@
+==============
+DOCKER INSTALL
+==============
+
 Building the image
 ------------------
 * Run the following command

doc/source/index.rst

@@ -15,6 +15,7 @@ Contents:
    installation
    testing_and_debugging
    distributed_dragonflow
+   docker_install
    distributed_dhcp
    pluggable_db
    pluggable_pubsub

setup.cfg

@@ -26,14 +26,6 @@ data_files =
     etc/neutron/ =
         etc/dragonflow_datapath_layout.yaml
 
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html
-
 [compile_catalog]
 directory = dragonflow/locale
 domain = dragonflow

test-requirements.txt

@@ -9,8 +9,6 @@ mock>=2.0.0 # BSD
 keystoneauth1>=3.4.0 # Apache-2.0
 python-pytun>=2.2.1 # MIT
 python-subunit>=1.3.0 # Apache-2.0/BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.5 # BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 testresources>=2.0.0 # Apache-2.0/BSD
@@ -18,5 +16,4 @@ testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 redis>=2.10.0 # MIT
 hiredis>=0.2.0 # BSD
-reno>=2.5.0 # Apache-2.0
 PrettyTable<0.8,>=0.7.2 # BSD

tox.ini

@@ -44,6 +44,8 @@ commands =
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:docs]
+basepython = python3
+deps = -r{toxinidir}/doc/requirements.txt
 commands = sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
 
 [flake8]