core: sync LUNs on SD status changes to active

Ensure invocation of SyncLunsInfoForBlockStorageDomain command
when a storage domain status changes to Active.

* VdsEventListener: added syncLunsInfoForBlockStorageDomain method
* IrsProxyData: perform synchronization when SD status is active:
- Upon getStoragePoolInfo callback and status change detection.
- Upon getVdsStats callback and active domain detection.

Change-Id: I31ccdaaa8f7f982cb38dd8f1c4488d76cba21463
Bug-Url: https://bugzilla.redhat.com/1115845
Signed-off-by: Daniel Erez <derez@redhat.com>