Add test framework

Change-Id: I1607827524338a02f4b9e156fb1beef99124e0b0

.gitignore

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+*~
+.tox

.zuul.yaml

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+---
+- project:
+    check:
+      jobs:
+        - openstack-tox-linters
+    gate:
+      jobs:
+        - openstack-tox-linters

test-requirements.txt

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+PyYAML>=3.1.0
+yamllint>=0.5.2

tox.ini

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+[tox]
+envlist = linters
+minversion = 2.3
+skipsdist = True
+
+[testenv]
+basepython = python3
+install_command = pip install -U {opts} {packages}
+setenv = VIRTUAL_ENV={envdir}
+         OS_STDOUT_CAPTURE=1
+         OS_STDERR_CAPTURE=1
+         OS_TEST_TIMEOUT=60
+deps = -r{toxinidir}/test-requirements.txt
+
+[testenv:linters]
+whitelist_externals = bash
+commands =
+  bash -c "find {toxinidir}        \
+            \( -name .tox -prune \)         \
+            -o -type f -name '*.yaml'       \
+            -print0 | xargs -0 yamllint"
+
+[testenv:venv]
+commands = {posargs}
+
+[testenv:true]
+# Use same environment directory as venv to save space and install time
+envdir = {toxworkdir}/venv
+commands = true
+whitelist_externals = true