[vrf]: Fix freezing during interface binding (sonic-net#1325)

* Replacing using 'get_all' with 'exists' in port state checking procedure inside bind function to avoid freezing in the while loop, what caused by absence of related record in STATE_DB.

Signed-off-by: Maksym Belei <[email protected]>

Author: maksymbelei95

config/main.py

@@ -3079,7 +3079,7 @@ def bind(ctx, interface_name, vrf_name):
         state_db = SonicV2Connector(use_unix_socket_path=True, namespace=ctx.obj['namespace'])
     state_db.connect(state_db.STATE_DB, False)
     _hash = '{}{}'.format('INTERFACE_TABLE|', interface_name)
-    while state_db.get_all(state_db.STATE_DB, _hash) != None:
+    while state_db.exists(state_db.STATE_DB, _hash):
         time.sleep(0.01)
     state_db.close(state_db.STATE_DB)
     config_db.set_entry(table_name, interface_name, {"vrf_name": vrf_name})