run_tests: fail if repos are not installed when asked

Stop the script if Puppet fails to deploy repositories.
It can happens in case of repo downstimes or timeouts.

Change-Id: I01326be2bc4ab8380ce2a371a6def38011a0523f

run_tests.sh

@@ -88,7 +88,12 @@ set +e
 if [ "${MANAGE_REPOS}" = true ]; then
     print_header 'Install repos'
     $SUDO $PUPPET_FULL_PATH apply $PUPPET_ARGS -e "include ::openstack_integration::repos"
+    if [ $? -ne 2 ]; then
+        print_header 'Puppet failed to install repositories.'
+        exit 1
+    fi
 fi
+
 print_header "Running Puppet Scenario: ${SCENARIO} (1st time)"
 run_puppet $SCENARIO
 RESULT=$?