Make managix scripts properly executable

Most of the scripts managix was using were missing the shebang at the beginning of the script.
This can be problematic if one uses a shell besides bash. This patch fixes that.

Change-Id: Ie7722f832d0d25bec049e123a0ed1570d0aeb650
Reviewed-on: https://asterix-gerrit.ics.uci.edu/286
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Raman Grover <ramangrover29@gmail.com>
diff --git a/asterix-events/src/main/resources/events/execute.sh b/asterix-events/src/main/resources/events/execute.sh
index 30f6c2f..3534c63 100644
--- a/asterix-events/src/main/resources/events/execute.sh
+++ b/asterix-events/src/main/resources/events/execute.sh
@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 USERNAME=$1
 if [ ! -d $MANAGIX_HOME/logs ];
 then