chore(contrib/rackspace): bump to CoreOS 379.3

Author: carmstrong

contrib/rackspace/provision-rackspace-cluster.sh

@@ -42,7 +42,7 @@ $CONTRIB_DIR/util/check-user-data.sh
 
 i=1 ; while [[ $i -le $DEIS_NUM_INSTANCES ]] ; do \
     echo_yellow "Provisioning deis-$i..."
-    supernova production boot --image afb5ee19-4e6e-42c3-841c-9663e99b83ba --flavor $FLAVOR --key-name $1 --user-data ../coreos/user-data --no-service-net --nic net-id=$NETWORK_ID --config-drive true deis-$i ; \
+    supernova production boot --image c3a4208a-3284-4e46-a99d-c29b56b457ba --flavor $FLAVOR --key-name $1 --user-data ../coreos/user-data --no-service-net --nic net-id=$NETWORK_ID --config-drive true deis-$i ; \
     ((i = i + 1)) ; \
 done