Add update step after enabling OpenStack repos

In specific cases, there may be conflicts between packages
provided by Centos and RDO repos. In that case RDO repos
should be used. To avoid any of these issues, this patch
updates packages right after enabling the repos.

Change-Id: Ide3265c5dc84971f19da2b5af049693cff5442b4

run_tests.sh

@@ -149,6 +149,14 @@ if [ "${MANAGE_REPOS}" = true ]; then
         print_header 'Puppet failed to install repositories.'
         exit 1
     fi
+    if is_fedora; then
+        print_header 'Updating packages'
+        $SUDO yum update -y
+        if [ $? -ne 0 ]; then
+            print_header 'Error updating packages'
+            exit 1
+        fi
+    fi
 fi
 
 print_header "Running Puppet Scenario: ${SCENARIO} (1st time)"