Follow the new PTI for document build

For compliance with the Project Testing Interface as
described in [1]:
[1] https://governance.openstack.org/tc/reference/project-testing-interface.html
For more detials information, please refer to [2]:
[2] http://lists.openstack.org/pipermail/openstack-dev/2017-December/125710.html

Change-Id: I1fe5352e8e4a7703bd9908e7221f04110163d6fb

doc/requirements.txt

@@ -0,0 +1,12 @@
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+openstackdocstheme>=1.17.0 # Apache-2.0
+reno>=2.5.0 # Apache-2.0
+doc8>=0.6.0 # Apache-2.0
+sphinx>=1.6.2 # BSD
+mock>=2.0.0 # BSD
+os-api-ref>=1.4.0 # Apache-2.0
+ddt>=1.0.1 # MIT
+fixtures>=3.0.0 # Apache-2.0/BSD
+oslotest>=3.2.0 # Apache-2.0

test-requirements.txt

@@ -12,7 +12,6 @@ fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0.0 # BSD
 iso8601>=0.1.11 # MIT
 oslotest>=3.2.0 # Apache-2.0
-openstackdocstheme>=1.17.0 # Apache-2.0
 
 # Do not remove 'PyMySQL' and 'psycopg2' dependencies. They are used
 # by oslo_db lib for running MySQL and PostgreSQL DB migration tests.
@@ -21,11 +20,8 @@ PyMySQL>=0.7.6 # MIT License
 psycopg2>=2.6.2 # LGPL/ZPL
 
 requests-mock>=1.1.0 # Apache-2.0
-sphinx>=1.6.2 # BSD
 os-api-ref>=1.4.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
 testresources>=2.0.0 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
-reno>=2.5.0 # Apache-2.0
-doc8>=0.6.0 # Apache-2.0

tox.ini

@@ -15,11 +15,15 @@ commands =
   ostestr {posargs}
 
 [testenv:releasenotes]
-whitelist_externals = rm
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build
   sphinx-build -a -E -W -d releasenotes/build/doctrees \
          -b html releasenotes/source releasenotes/build/html
+whitelist_externals = rm
 
 [testenv:debug]
 commands = oslo_debug_helper {posargs}
@@ -64,12 +68,16 @@ commands = oslopolicy-sample-generator --config-file=etc/manila/manila-policy-ge
 commands = {posargs}
 
 [testenv:docs]
-whitelist_externals = rm
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/doc/requirements.txt
 commands =
   rm -rf doc/build
-  python setup.py build_sphinx
+  sphinx-build -b html doc/source doc/build/html
   # Ignore D001 since we allow lines in excess of 79 characters.
   doc8 --ignore D001 --ignore-path .tox --ignore-path doc/build --ignore-path manila.egg-info -e txt -e rst
+whitelist_externals = rm
 
 [testenv:cover]
 setenv =