NPE Exception while processing Interfaces
Description: Its been observed that if the port is created first
followed by setting the external-ids, the termination points are
not updated properly with is external-ids.
Changes are done to cache the bridge Identifier and refer this cache
during interface-update is obtained for the port.
Signed-off-by: Chetan Arakere Gowdru <chetan.arakere@altencalsoftlabs.com>
Change-Id: I8e55733bccfa8dae013dda985678514e1ceb98d5
Signed-off-by: Chetan Arakere Gowdru <chetan.arakere@altencalsoftlabs.com>