Fix pip package version

The python "cmd2" package installs version 0.9+ on Python 2.7, which only
support Python 3.4+. This causes a dependency error in the gate due to
issue outlined in [0].  We will pre-install a capped version of "cmd2"
that would work with Python 2.7.

This patch set also temporarily make the keystone webhook non-voting as
this bug is causing a circular dependencies with patch [1]. Once this is
fixed, a new patch will be submitted to make this voting again.

[0] https://github.com/python-cmd2/cmd2/issues/421
[1] https://review.openstack.org/#/c/571093/

Change-Id: I34cbde65b74efc2805bd7785f84878783d2badbf

.zuul.yaml

@@ -38,6 +38,7 @@
               - ^doc/.*$
               - ^releasenotes/.*$
         - openstack-helm-infra-kubernetes-keystone-auth:
+            voting: false
             irrelevant-files:
               - ^.*\.rst$
               - ^doc/.*$
@@ -60,11 +61,13 @@
               - ^.*\.rst$
               - ^doc/.*$
               - ^releasenotes/.*$
-        - openstack-helm-infra-kubernetes-keystone-auth:
-            irrelevant-files:
-              - ^.*\.rst$
-              - ^doc/.*$
-              - ^releasenotes/.*$
+        # TODO(lamt): Need to reenable this once the circular dependencies between
+        # OSH and OSH-infra to fix the gate.
+        # - openstack-helm-infra-kubernetes-keystone-auth:
+        #     irrelevant-files:
+        #       - ^.*\.rst$
+        #       - ^doc/.*$
+        #       - ^releasenotes/.*$
 
 - nodeset:
     name: openstack-helm-single-node

tools/gate/devel/start.sh

@@ -55,6 +55,9 @@ function ansible_install {
 
   sudo -H -E pip install --no-cache-dir --upgrade pip
   sudo -H -E pip install --no-cache-dir --upgrade setuptools
+  # NOTE(lamt) Preinstalling a capped version of cmd2 to address bug:
+  # https://github.com/python-cmd2/cmd2/issues/421
+  sudo -H -E pip install --no-cache-dir --upgrade "cmd2<=0.8.7"
   sudo -H -E pip install --no-cache-dir --upgrade pyopenssl
   sudo -H -E pip install --no-cache-dir --upgrade \
     ansible \