meta-google: gbmc-bridge: DHCP should not retry after success

A powercycle will be required in order to kick off DHCP again. If the
machine succeeds once, the power cycle service will be available for
future attempts.

Change-Id: I3b741250fd673bbe19056506f7287ef2ed734ea0
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp.service b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp.service
index 7eb0ce0..8a5c711 100644
--- a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp.service
+++ b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp.service
@@ -5,7 +5,7 @@
 StartLimitBurst=3
 
 [Service]
-Restart=always
+Restart=on-failure
 RestartSec=5
 ExecStart=/usr/bin/udhcpc6 -f -q -O fqdn -O bootfile_url -O bootfile_param -i gbmcbr -s /usr/libexec/gbmc-br-dhcp.sh