Do not pip install keystoneclient on the host

The keystoneclient package is being installed on the host by PIP but
that means that a whole bunch of required dependencies are being pulled
in as well.

This brings the host to a rather messed up state when installing
keystone from distro packages, since distribution and
PIP packages are being mixed together. We only need the client to
register the service with keystone so we can simply use the distro
package for that to avoid installing lots of PIP packages on the
host.

Implements: blueprint openstack-distribution-packages
Change-Id: I3759995cfb8192145d1b871158c95f594751a759

defaults/main.yml

@@ -183,7 +183,6 @@ heat_plugin_dirs:
 # Heat packages that must be installed before anything else
 heat_requires_pip_packages:
   - virtualenv
-  - python-keystoneclient # Keystoneclient needed to OSA keystone lib
   - httplib2
 
 # Common pip packages

vars/redhat-7.yml

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 heat_distro_packages:
+  - python-keystoneclient # Keystoneclient needed to OSA keystone lib
   - rsync
   - libxslt
   - which

vars/suse-42.yml

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 heat_distro_packages:
+  - python-keystoneclient # Keystoneclient needed to OSA keystone lib
   - rsync
   - libxslt
   - which

vars/ubuntu-16.04.yml

@@ -17,6 +17,7 @@
 cache_timeout: 600
 
 heat_distro_packages:
+  - python-keystoneclient # Keystoneclient needed to OSA keystone lib
   - rsync
   - libxslt1.1