In I62c4935bcc7f684bfe850f88f1b80e8970e0e098 we added a new example
config file, but didn't actually package it in dpkg or rpm packages
yet. This also lead to package build failures like:
[ 39s] RPM build errors:
[ 39s] Installed (but unpackaged) file(s) found:
[ 39s] /usr/share/doc/osmo-hnbgw/examples/osmo-hnbgw/osmo-hnbgw-pfcp.cfg
Change-Id: I7c5c346f67f003b2cc5d74e812441c3704b133ef