Be more lenient on input version.

RPC is using r11 and 11 for kilo, same for upper branches.
We should be more lenient to the version allowed, whether it's
starting with a r or not, as long as the major version is the
same number.

Change-Id: I42053681fdc5e0b2c16060d8a51b4a620569f38c

leap-upgrades/lib/functions.sh

@@ -166,19 +166,19 @@ function discover_code_version {
     else
         source /etc/openstack-release
         case "${DISTRIB_RELEASE%%.*}" in
-            '11')
+            *11)
                 export CODE_UPGRADE_FROM="KILO"
                 notice "You seem to be running Kilo"
             ;;
-            '12')
+            *12)
                 export CODE_UPGRADE_FROM="LIBERTY"
                 notice "You seem to be running Liberty"
             ;;
-            '13')
+            *13)
                 export CODE_UPGRADE_FROM="MITAKA"
                 notice "You seem to be running Mitaka"
             ;;
-            '14')
+            *14)
                 export CODE_UPGRADE_FROM="NEWTON"
                 notice "You seem to be running Newton"
             ;;