Adjust molecule requirements

This change uses the same pytest/molecule requirements spec as
tripleo-quickstart and breaks out the requirements into their own
file.

[1] https://review.opendev.org/#/c/713532/
Closes-Bug: #1867035

Change-Id: I728183f608eb7ab9571d66cc8c515fe52f4dafc0

molecule-requirements.txt

@@ -0,0 +1,11 @@
+ansible
+ansi2html  # GPL (soft-dependency of pytest-html)
+docker
+paramiko>=2.5.0  # LGPL (soft-dependency of docker that enables ssh protocol)
+pytest
+pytest-cov
+pytest-html
+pytest-molecule
+mock
+molecule>=3.0,<3.1
+selinux>=0.2.1

tox.ini

@@ -53,16 +53,6 @@ basepython = python3
 commands = {posargs}
 
 [testenv:molecule]
-deps =
-    ansible
-    ansi2html  # GPL (soft-dependency of pytest-html)
-    docker
-    paramiko>=2.5.0  # LGPL (soft-dependency of docker that enables ssh protocol)
-    pytest-cov  # MIT
-    pytest-html<=2.0.1  # MPL 2.0
-    pytest-molecule<=1.2.3  # MIT
-    selinux  # MIT
-    mock
-    molecule>=3.0a6
+deps = -r{toxinidir}/molecule-requirements.txt
 commands =
     python -m pytest --color=yes --html={envlogdir}/reports.html --self-contained-html -rA --molecule-unavailable-driver=fail {tty:-s} {posargs:-k 'molecule and docker'}