Fix extension's groupId
Fix extension's groupId

Rather than inheriting odlparent, make sure we use bgpcep.

Change-Id: I64c696d67d178c243fc6cf76ef3762c329b7b9ef
Signed-off-by: Robert Varga <91ae5aa8c7a9f7e57b701db766e23e544aaa6ae9@pantheon.tech>

opendaylight/bgpcep