meta-google: gbmc-bridge: Remove status when dhcp process stops

We don't want stale ongoing flags left in the filesystem and reported to
the installer, if we terminate we should delete the status file
entirely to convey DHCP is stopped.

Tested: Verified that stopping the service deletes the file
Change-Id: I98a4a9e7a35c2235ab02db9af39a99b4d4bfb701
Signed-off-by: William A. Kennington III <wak@google.com>

meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-dhcp@.service

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 c13b9fb..942c13d 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
@@ -10,6 +10,7 @@
 Restart=on-failure
 RestartSec=5
 ExecStart=/usr/bin/udhcpc6 -f -q -O fqdn -O bootfile_url -O bootfile_param -i %I -s /usr/libexec/gbmc-br-dhcp.sh ${GBMCBR_VENDOR_CLASS_V6}
+ExecStopPost=-/bin/rm -f /run/dhcp_status
 
 [Install]
 WantedBy=multi-user.target