BUG-2115 : added zero subcode to BGP CEASE Notify message to avoid NPE

Change-Id: I6102d73e9bd3ff86f2238f1af249cee3094711b2
Signed-off-by: Dana Kutenicsova <dkutenic@cisco.com>
(cherry picked from commit 8be8ae9818e58e91581926646b05f70b7d070661)
Merge "BUG-2115 : added zero subcode to BGP CEASE Notify message to avoid NPE"