Adding Quagga to build

Builds 6Wind ZRPC, Quagga, and dependencies required for OpenDaylight
with BGPVPN scenario.  Packages are built into RPMs, and left on the
overcloud disk in /root/quagga.  They are then installed at deploy time
if VPN feature flag is enabled.  Note, for proper upstream we should
create a zrpc OOO service, but that can be a follow up patch.  For that
we would also need official packaging/build system upstream somewhere.

JIRA: APEX-357

Changes Include:
 - Build thrift rpm
 - Build c-capnproto rpm
 - Build quagga rpm
 - Build zrpcd rpm
 - Configure bgpd
 - Detect deploy with VPN and install pkgs
 - Enable zrpcd with systemd

Change-Id: I9825694f46aaab48a3d1cd5fc4d9a24c7370e8fa
Signed-off-by: Tim Rozet <trozet@redhat.com>
Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>
Signed-off-by: Romanos Skiadas <rski@intracom-telecom.com>