core: SyncLunsInfo when activating FC storage domain

* Invoke SyncLunsInfoForBlockStorageDomainCommand on
  FCPStorageHelper -> connectStorageToDomainByVdsId.
* Renamed SyncLunsInfoForIscsiStorageDomainCommand to
  SyncLunsInfoForBlockStorageDomainCommand for defining
  its purpose accurately.

Change-Id: I31f3e376120e7b30a74af8d1fc7e3ed5346411f8
Bug-Url: https://bugzilla.redhat.com/1066081
Signed-off-by: Daniel Erez <derez@redhat.com>