Add -constraints sections for CI jobs

Tox does not currently support using factors with sections, and work
towards enabling this has stalled, as such we will need to duplicate
sections adding -constraints to facilitate running sections with the
constrained install_command.

Implements Blueprint: Requirements-Management

Depends-On: I59fcf763d7eb9252e950dce5783befc20b4e8fd4
Change-Id: Icbbb78cfcd074b0050e60c54557637af723f9b92
(cherry picked from commit a42e53a8a7)

tox.ini

@@ -10,7 +10,7 @@ whitelist_externals = bash
                       find
                       rm
 install_command =
-                  constraints: pip install -U --force-reinstall -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+                  constraints: {[testenv:common-constraints]install_command}
                   pip install -U --force-reinstall {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
          OS_TEST_PATH=./nova/tests/unit
@@ -28,10 +28,18 @@ passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 [tox:jenkins]
 downloadcache = ~/cache/pip
 
+[testenv:common-constraints]
+install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt?h=stable/liberty} {opts} {packages}
+
 [testenv:pep8]
 commands =
   bash tools/flake8wrap.sh {posargs}
 
+[testenv:pep8-constraints]
+install_command = {[testenv:common-constraints]install_command}
+commands =
+  bash tools/flake8wrap.sh {posargs}
+
 [testenv:py34]
 setenv = {[testenv]setenv}
 deps = -r{toxinidir}/requirements.txt
@@ -128,6 +136,13 @@ commands =
     nova.tests.unit.test_utils \
     nova.tests.unit.test_versions
 
+[testenv:py34-constraints]
+install_command = {[testenv:common-constraints]install_command}
+setenv = {[testenv]setenv}
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+commands = {[testenv:py34]commands}
+
 [testenv:functional]
 usedevelop = True
 install_command = pip install -U --force-reinstall {opts} {packages}
@@ -140,6 +155,14 @@ commands =
   find . -type f -name "*.pyc" -delete
   bash tools/pretty_tox.sh '{posargs}'
 
+[testenv:functional-constraints]
+usedevelop = {[testenv:functional]usedevelop}
+install_command = {[testenv:common-constraints]install_command}
+setenv = {[testenv:functional]setenv}
+commands =
+  find . -type f -name "*.pyc" -delete
+  bash tools/pretty_tox.sh '{posargs}'
+
 [testenv:genconfig]
 commands = oslo-config-generator --config-file=etc/nova/nova-config-generator.conf
 
@@ -153,9 +176,24 @@ commands =
   coverage combine
   coverage html --include='nova/*' --omit='nova/openstack/common/*' -d covhtml -i
 
+[testenv:cover-constraints]
+install_command = {[testenv:common-constraints]install_command}
+# Also do not run test_coverage_ext tests while gathering coverage as those
+# tests conflict with coverage.
+commands =
+  coverage erase
+  python setup.py testr --coverage \
+    --testr-args='{posargs}'
+  coverage combine
+  coverage html --include='nova/*' --omit='nova/openstack/common/*' -d covhtml -i
+
 [testenv:venv]
 commands = {posargs}
 
+[testenv:venv-constraints]
+install_command = {[testenv:common-constraints]install_command}
+commands = {posargs}
+
 [testenv:docs]
 commands =
   rm -rf doc/source/api doc/build
@@ -163,6 +201,10 @@ commands =
   bash -c '! find doc/ -type f -name *.json | xargs -t -n1 python -m json.tool 2>&1 > /dev/null | grep -B1 -v ^python'
   oslo-config-generator --config-file=etc/nova/nova-config-generator.conf
 
+[testenv:docs-constraints]
+install_command = {[testenv:common-constraints]install_command}
+commands = {[testenv:docs]commands}
+
 [testenv:bandit]
 deps = -r{toxinidir}/test-requirements.txt
 commands = bandit -c bandit.yaml -r nova -n 5 -ll