Add python unit test jobs

These don't do much yet except prep.

Change-Id: I350355dda687edf8cc839f949993c1d7ab8baf96

.zuul.yaml

@@ -0,0 +1,21 @@
+- job:
+    name: unittests
+    parent: base
+    pre-run: unittests/pre
+
+- job:
+    name: unittests-python
+    parent: unittests
+    run: unittests/python
+
+- job:
+    name: python27
+    parent: unittests-python
+    vars:
+      zuul_python_version: 27
+
+- job:
+    name: python35
+    parent: unittests-python
+    vars:
+      zuul_python_version: 35

playbooks/unittests/pre.yaml

@@ -0,0 +1,4 @@
+hosts: all
+roles:
+  - extra-test-setup
+  - revoke-sudo

playbooks/unittests/python.yaml

@@ -0,0 +1,2 @@
+hosts: all
+roles: []