fix(tarsnap): rotate script fails on error

Scripts used to rotate tarsnap backups exit when a command fails
Cron will catch that return code is not zero and will send message to root

No more silent failure

roles/tarsnap/files/tarsnap.sh

 MONTHLY_DAY=01
 
 # Path to tarsnap
-#TARSNAP="/home/tdb/tarsnap/tarsnap.pl"
 TARSNAP="/usr/local/bin/tarsnap"
 
 # end of config
 
+set -e
+
 # day of week: 1-7, monday = 1
 DOW=`date +%u`
 # day of month: 01-31
 
 # Do backups
 for dir in $DIRS; do
-	# nasty bodge for my large /home :-)
-	EXTRA_FLAGS=
-	if [ X"$dir" = X"/home" ]; then
-		EXTRA_FLAGS="--lowmem"
-	fi
-
 	echo "==> create $BACKUP-$dir"
 	$TARSNAP $EXTRA_FLAGS -c -f $BACKUP-$dir $dir
 done