meta-google: gbmc-bridge: Implement DHCP

This makes it possible for a BMC to acquire a public address via DHCP
provisioning.

None of the update processes are included yet.

Change-Id: I51ca2aa4859bcd2b9e909dd5a0d9e66cfbd648af
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-google/ncsi/files/gbmc-ncsi-br-pub-addr.sh.in b/meta-google/recipes-google/ncsi/files/gbmc-ncsi-br-pub-addr.sh.in
index 5adc413..7934033 100644
--- a/meta-google/recipes-google/ncsi/files/gbmc-ncsi-br-pub-addr.sh.in
+++ b/meta-google/recipes-google/ncsi/files/gbmc-ncsi-br-pub-addr.sh.in
@@ -63,6 +63,8 @@
 Type=unreachable
 Metric=1024
 EOF
+    # Delete DHCP configured addresses if we have a host published address
+    rm -f /etc/systemd/network/{00,}-bmc-gbmcbr.network.d/50-public.conf
   fi
 
   local file