Temporarily pin to ansible==1.9.4

New ansible 2.0 doesn't support ansible-lint

This is shown on https://github.com/willthames/ansible-lint/issues/75,
and is breaking our ansible-lint tests.

Change-Id: I3eef420084104eead1fb24eb537723214296fa5d

jenkins/jobs/ansible-role-jobs.yaml

@@ -1,9 +1,10 @@
+# TODO(yolanda): Pin to 1.9.4 since ansible-lint does not support 2.0
 - job-template:
     name: 'gate-{name}-ansible-lint'
     node: '{node}'
 
     builders:
-      - ansible-prep
+      - ansible-prep-pinned
       - ansible-lint-prep
       - revoke-sudo
       - gerrit-git-prep

jenkins/jobs/macros.yaml

@@ -335,6 +335,14 @@
           #!/bin/bash -xe
           sudo -H pip install -U ansible
 
+# TODO (yolanda): Pin to 1.9.4 since ansible-lint does not support 2.0
+- builder:
+    name: ansible-prep-pinned
+    builders:
+      - shell: |
+          #!/bin/bash -xe
+          sudo -H pip install -U ansible==1.9.4
+
 - builder:
     name: ansible-syntax
     builders: