Remove unnecessary distro package installs

There appears to be no need for the openstack packages
to be installed by this role, especially given that
they conflict with the installs done by the utility
playbook when doing a source-based install.

Also, the other packages in the list appear to be a
remnant of the past. It appears that neither 'which'
or 'rsync' are used in the role through shell commands
or ansible modules.

Change-Id: Ib757dd2616f6d6aa6ebc6b870b76b3fa2ac7c8f6

vars/redhat-7.yml

@@ -15,11 +15,3 @@
 
 tempest_distro_packages:
   - git
-  - postgresql-devel
-  - python-glanceclient
-  - python-keystoneclient
-  - python-neutronclient
-  - python-novaclient
-  - python2-shade
-  - rsync
-  - which

vars/suse.yml

@@ -16,11 +16,3 @@
 
 tempest_distro_packages:
   - git-core
-  - postgresql-devel
-  - python-glanceclient
-  - python-keystoneclient
-  - python-neutronclient
-  - python-novaclient
-  - python-shade
-  - rsync
-  - which

vars/ubuntu.yml

@@ -18,9 +18,3 @@ cache_timeout: 600
 
 tempest_distro_packages:
   - git-core
-  - libpq-dev
-  - python-glanceclient
-  - python-keystoneclient
-  - python-neutronclient
-  - python-novaclient
-  - rsync