Bug-6621: ModifiedNodeDoesNotExistException encountered while building Linkstate topology
- added null check in BGP topology builder removeObject() method to
gracefully handle issue created by BUG-6577
- when destroying operational topology to recover from a failure,
flush the internally stored topology info as well so that both are in sync
Change-Id: Id239d74738d43dd63177aa3b2ba1d3d9136c3338
Signed-off-by: Ajay <ajayl.bro@gmail.com>
(cherry picked from commit
b4657f9d04a5e0d30fa6d275ef933c420d9016c8)