Establish in-repo Ranger Checks and Gates

Ranger is removing themselves from the
central project-config management of
checks and gates in zuul.d/projects.yaml
as part if its python 3.6 upgrade. This
patchset moves those same checks into
the ranger repository.

Change-Id: I66335f3c50a8c0f416c737a858fdd69ce0ea5c5f

.zuul.yaml

@@ -0,0 +1,9 @@
+- project:
+    check:
+      jobs:
+        - openstack-tox-pep8
+        - openstack-tox-py27
+    gate:
+      jobs:
+        - openstack-tox-pep8
+        - openstack-tox-py27

tox.ini

@@ -21,14 +21,12 @@ whitelist_externals =
   bash
   find
 
-[testenv:bandit]
-deps = .[bandit]
-commands = bandit-baseline -r orm -n5 -c bandit.yaml
-
 [testenv:pep8]
+deps =
+  -r{toxinidir}/test-requirements.txt
 commands =
   flake8 {posargs}
-  {[testenv:bandit]commands}
+  bandit-baseline -r orm -n 5 -c bandit.yaml
 
 [testenv:venv]
 commands = {posargs}