Refactored tox requirements for different Ansible releases

Sorted pip requirements file to improve readability.

Moved pip requirements for tests into tests subdirectory and dropped
'pip-' prefix to shorten filenames and conform with common naming
scheme for pip requirements files.

Added constrains on OpenStack SDK 1.*.* to job ansible-collections-\
openstack-functional-devstack-releases on master branch because only
stable/1.0.0 branch is compatible to the OpenStack SDK 0.*.* series.

Changed job ansible-collections-openstack-functional-devstack-releases
on master branch to non-voting because OpenStack SDK 1.*.* has not
been released to PyPI yet, so tests on master branch are expected to
fail once we introduce breaking changes from stable/1.0.0 branch.

Change-Id: I6b6bb8c6900f7c8341bbf3f9a24999fbf693ba4b

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 3.18.0
-envlist = pep8
+envlist = linters
 skipsdist = True
 ignore_basepython_conflict = True
 
@@ -21,8 +21,8 @@ setenv =
     OS_STDERR_CAPTURE={env:OS_STDERR_CAPTURE:true}
     pip: PIP_INSTALL={env:PIP_INSTALL:true}
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements.txt
+    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/constraints-none.txt}
+    -r{toxinidir}/tests/requirements.txt
     pip: {toxinidir}
 
 commands = stestr run {posargs}
@@ -34,10 +34,10 @@ commands =
 
 [testenv:build]
 deps =
+    ansible-core
+    galaxy-importer
     pbr
     ruamel.yaml
-    galaxy-importer
-    ansible-core
 
 commands =
     python {toxinidir}/tools/build.py
@@ -59,28 +59,22 @@ commands =
 passenv = {[testenv:linters]passenv}
 commands = {[testenv:linters]commands}
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements-2.9.txt
+    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/constraints-none.txt}
+    -r{toxinidir}/tests/requirements-ansible-2.9.txt
 
 [testenv:linters-2.11]
 passenv = {[testenv:linters]passenv}
 commands = {[testenv:linters]commands}
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements-2.11.txt
+    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/constraints-none.txt}
+    -r{toxinidir}/tests/requirements-ansible-2.11.txt
 
 [testenv:linters-2.12]
 passenv = {[testenv:linters]passenv}
 commands = {[testenv:linters]commands}
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements-2.12.txt
-
-[testenv:venv]
-deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements.txt
-commands = {posargs}
+    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/constraints-none.txt}
+    -r{toxinidir}/tests/requirements-ansible-2.12.txt
 
 [flake8]
 # W503 Is supposed to be off by default but in the latest pycodestyle isn't.
@@ -104,33 +98,24 @@ deps =
 commands =
     /bin/bash {toxinidir}/ci/run-ansible-tests-collection.sh -e {envdir} {posargs}
 
-# PIP job runs with Ansible-2.9
-[testenv:ansible-pip]
-deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements-2.9.txt
-    {toxinidir}
-passenv = {[testenv:ansible]passenv}
-commands = {[testenv:ansible]commands}
-
 [testenv:ansible-2.9]
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements-2.9.txt
+    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/constraints-none.txt}
+    -r{toxinidir}/tests/requirements-ansible-2.9.txt
 passenv = {[testenv:ansible]passenv}
 commands = {[testenv:ansible]commands}
 
 [testenv:ansible-2.11]
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements-2.11.txt
+    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/constraints-none.txt}
+    -r{toxinidir}/tests/requirements-ansible-2.11.txt
 passenv = {[testenv:ansible]passenv}
 commands = {[testenv:ansible]commands}
 
 [testenv:ansible-2.12]
 deps =
-    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/pip-constraints-none.txt}
-    -r{toxinidir}/test-requirements-2.12.txt
+    -c{env:TOX_CONSTRAINTS_FILE:{toxinidir}/tests/constraints-none.txt}
+    -r{toxinidir}/tests/requirements-ansible-2.12.txt
 passenv = {[testenv:ansible]passenv}
 commands = {[testenv:ansible]commands}