trusty WA for dhcp client core-dump

Closes-Bug: PROD-21514 (PROD:21514)

Change-Id: I9426e348d7d1056632332090f7c372c74018d297
diff --git a/mirror-image/scripts/reboot.sh b/mirror-image/scripts/reboot.sh
index 52adc95..bddc2a9 100644
--- a/mirror-image/scripts/reboot.sh
+++ b/mirror-image/scripts/reboot.sh
@@ -1,2 +1,6 @@
+#!/bin/bash -x
+
+echo 3 > /proc/sys/vm/drop_caches
+sync
 pgrep -f "sshd: root@" | xargs kill -9
-reboot now
\ No newline at end of file
+reboot now