meta-google: ncsi: rate limit dhcrelay logs

When the service failed e.g. when interface has no ip, it will print a
lot of error messages on every restart. This adds a rate limit.

Change-Id: Idd5c74c0d4a0b87f477092a873a1d54272365cb5
Signed-off-by: Yuxiao Zhang <yuxiaozhang@google.com>
diff --git a/meta-google/recipes-google/ncsi/files/gbmc-ncsi-dhcrelay.service.in b/meta-google/recipes-google/ncsi/files/gbmc-ncsi-dhcrelay.service.in
index 62a519a..078d1e2 100644
--- a/meta-google/recipes-google/ncsi/files/gbmc-ncsi-dhcrelay.service.in
+++ b/meta-google/recipes-google/ncsi/files/gbmc-ncsi-dhcrelay.service.in
@@ -3,6 +3,8 @@
 After=network.target
 StartLimitIntervalSec=10
 StartLimitBurst=3
+LogRateLimitIntervalSec=120
+LogRateLimitBurst=100
 
 [Service]
 Restart=always