CLOUDSTACK-7842: wrong size column is getting updated with snapshot physical size in snapshot_store_ref table.

Also fixed the issue that snapshot size with hypervisor XS >= 6.2.5 is not getting updated in snapshot_store_ref table.
CLOUDSTACK-7822: merge, test sslcert ca
commented broken unit test
CLOUDSTACK-7850: UI > Instances > detailView > Attach ISO option > ISO dropdown > should list only ISOs belonging to the same zone.
Fixed coverity issue

CID 11461 (#1 of 1): DLS: Dead local store (FB.DLS_DEAD_LOCAL_STORE)
Merge branch '4.5'