[Reviewer: Matt][From: Alex] Prevent monit from spuriously restarting sprout

Matt please can you review this change that fixes #50. Should hopefully be self explanatory. 

I never got to the bottom of why we saw issue 50 on openstack and not amazon. To be sure I have tested on both as follows:
*  Sprout running (not monitored). Run poll_sprout.sh 20 times and check it returns 0 each time. 
*  Sprout stopped (not monitored). Run poll_sprout.sh 20 times and check it returns 1 each time (and gives error message).