Install rhos-log-collector only on RHEL systems

- sos-plugins-openstack is obsolete and had been backported into the
  main package since sos-3.0-23.el7_0.4 released Nov 2014 [1]
- sos is in fedora, so it should be install on fedora too.

[1] https://rhn.redhat.com/errata/RHBA-2014-1871.html

Change-Id: I7a94a09913388303dd271bfa3e055563716617d2
(cherry picked from commit cd467f7491)

packstack/plugins/serverprep_001.py

@@ -645,15 +645,12 @@ def server_prep(config, messages):
         server.append('rpm -q --whatprovides yum-utils || '
                       'yum install -y yum-utils')
 
-        # Installing rhos-log-collector and sos-plugins-openstack if
-        # these rpms are available from yum.
-        sos_rpms = ' '.join(('rhos-log-collector',
-                             'sos',
-                             'sos-plugins-openstack'))
+        if is_rhel():
+            # Installing rhos-log-collector if it is available from yum.
+            server.append('yum list available rhos-log-collector && '
+                          'yum -y install rhos-log-collector || '
+                          'echo "no rhos-log-collector available"')
 
-        server.append('yum list available rhos-log-collector && '
-                      'yum -y install %s || '
-                      'echo "no rhos-log-collector available"' % sos_rpms)
         server.execute()
 
         # enable RDO if it is installed locally

packstack/puppet/templates/prescript.pp

@@ -23,6 +23,10 @@ if $::operatingsystem in $el_releases and $::operatingsystemmajrelease < 7 {
   }
 }
 
+package { 'sos':
+  ensure => present,
+}
+
 package { 'audit':
   ensure => present,
 } ->