Add zuul check and gate jobs to this new repo

This job adds a single linters tox target.

The linters target is an aggregation of linters for
this repo including:
 - bashate

Other linters such as yamllint can be added to this
repo by later commits.

Change-Id: Ic3608094592001a4a7dbb2e4cf4aaa81740d41a6
Story: 2006166
Task: 36540
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>

.gitignore

@@ -0,0 +1 @@
+.tox

.zuul.yaml

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

requirements.txt

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+# Nothing

test-requirements.txt

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+# hacking pulls in flake8
+hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+bashate >= 0.2

tox.ini

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+[tox]
+envlist = linters
+minversion = 2.3
+skipsdist = True
+sitepackages=False
+
+[testenv]
+install_command = pip install -U {opts} {packages}
+setenv =
+   VIRTUAL_ENV={envdir}
+   OS_STDOUT_CAPTURE=1
+   OS_STDERR_CAPTURE=1
+   OS_DEBUG=1
+   OS_LOG_CAPTURE=1
+deps =
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/test-requirements.txt
+whitelist_externals =
+  bash
+
+[testenv:bashate]
+# Treat all E* codes as Errors rather than warnings using: -e 'E*'
+# xargs -r handles empty input
+commands =
+  bash -c "find {toxinidir}                    \
+         -not \( -type d -name .?\* -prune \) \
+         -type f                              \
+         -not -name \*~                       \
+         -not -name \*.md                     \
+         -name \*.sh                          \
+         -print0 | xargs -r -n 1 -0 bashate -v   \
+         -e 'E*'"
+
+[testenv:linters]
+commands =
+    {[testenv:bashate]commands}