Add <relativePath/> to ensure Maven pulls artifact from Nexus
Add <relativePath/> to ensure Maven pulls artifact from Nexus

Needed by autorelease to be able to find and replace this value
prebuild.

Change-Id: I0f3368e7a10546eedcef7fca46ea93c5decf116b
Signed-off-by: Thanh Ha <09ea4d3a79c8bee41a16519f6a431f6bc0fd8d6f@linuxfoundation.org>

opendaylight/packetcable,opendaylight/packetcable