Add a new ssconf file with the ganeti version

The patch adds a new ssconf file containing the ganeti version.

Reviewed-by: imsnah

lib/config.py

@@ -992,6 +992,7 @@ class ConfigWriter:
       constants.SS_MASTER_NODE: cluster.master_node,
       constants.SS_NODE_LIST: node_data,
       constants.SS_OFFLINE_NODES: off_data,
+      constants.SS_RELEASE_VERSION: constants.RELEASE_VERSION,
       }
 
   @locking.ssynchronized(_config_lock)

lib/constants.py

@@ -414,6 +414,7 @@ SS_MASTER_NETDEV = "master_netdev"
 SS_MASTER_NODE = "master_node"
 SS_NODE_LIST = "node_list"
 SS_OFFLINE_NODES = "offline_nodes"
+SS_RELEASE_VERSION = "release_version"
 
 # cluster wide default parameters
 DEFAULT_ENABLED_HYPERVISOR = HT_XEN_PVM

lib/ssconf.py

@@ -133,6 +133,7 @@ class SimpleStore(object):
     constants.SS_MASTER_NODE,
     constants.SS_NODE_LIST,
     constants.SS_OFFLINE_NODES,
+    constants.SS_RELEASE_VERSION,
     )
   _MAX_SIZE = 131072