[server][UnifiedDataStore] Return DataStorePtr to avoid developers from being confused.
[server][UnifiedDataStore] Add a new method: getServerConnStatusVector().
[server][ArmStatus] Rename a member to match with the similar members.

numUpdated ->
numUpdate

The similar member is 'numFailure', which consists of 'num and
a noun 'Failure'. This patch also renames it  with a naun.
[server][UnifiedDataStore] Add an option to control the initial running state of DataStore.
[server][testUnifiedDataStore] Make a test simple with the servers setup by default.
[server][FaceRest] Add a new API: '/server-conn-stat' that provides information of the status about servers.
[server][testFaceRest] Fix a bug that calls starObject twice.
[server][testFaceRest] Check the return value of startObject().
[hatohol-voyager] Add a command: 'server-conn-stat'.
Merge branch 'issue137'