…#2254)

Vlan delete couldn't be handled by OA when there is fdb learnt on the member and when the member is deleted
This inability of handling APPL_DB notif is affecting warm-restart. FDB Entry from State DB is not removed.
OA doesn't have the logic to handle consolidate flush notif coming from syncd
FdbOrch doesn't have logic to clear internal cache and decrement corresponding fdb counters during a flush notification

Signed-off-by: Vivek Reddy Karri <vkarri@nvidia.com>

- What I did
using a copy of FDBEntry fields (stored in FDBUpdate) instead of a reference since the reference gets invalidated in the storeFdbEntryState()
simplified clearFdbEntry() interface

- Why I did it
To fix the memory usage issue
The issue is that the SWSS_LOG_INFO() uses the mac&, port_alias&, and bv_id& which are invalidated in the storeFdbEntryState().

- How I verified it
Run the tests that were used to find the issues and checked the ASAN report

Signed-off-by: Yakiv Huryk <yhuryk@nvidia.com>