CLOUDSTACK-4093
UCS:API: Need delete UCS_manager API
CLOUDSTACK-4047 [sM][VMWare][ZWPS]: no need of storage migration while migrating VM when the root volume is on zone wide primary storage

Introduced check for zone wide pools while listing hosts for migration.

Signed-off-by: Sateesh Chodapuneedi <sateesh@apache.org>