Add the ability to pass additional tags with `startstop'.

It may be necessary to pass additional tags when running tcollector.
In our case we are monitoring host level OpenStack systems, and
want to roll up into availability zones and hypervisor type.

./startstop start -t az=paloalto0 hv=kvm

Change-Id: Id48e4442dd984cd670d4677bbd5f393368501621
Signed-off-by: Benoit Sigoure <tsunanet@gmail.com>

startstop

@@ -13,7 +13,10 @@ HOSTNAME=$(hostname)
 PIDFILE=${PIDFILE-'/var/run/tcollector.pid'}
 PROG=$TCOLLECTOR_PATH/tcollector.py
 LOG=${LOG-'/var/log/tcollector.log'}
+COMMAND=$1
+shift
 ARGS="-c $TCOLLECTOR_PATH/collectors -H $TSD_HOST -t host=$HOSTNAME -P $PIDFILE"
+ARGS="$ARGS $@"
 
 # Sanity checks.
 test -d "$TCOLLECTOR_PATH" || {
@@ -84,7 +87,7 @@ forcerestart () {
     start
 }
 
-case $1 in
+case $COMMAND in
     start)  status || start
         ;;
     force-restart)
@@ -113,7 +116,7 @@ case $1 in
     status) status
             exit $?
         ;;
-    *)  echo >&2 "usage: $0 <start|stop|restart|status|force-restart>"
+    *)  echo >&2 "usage: $0 <start [args]|stop|restart|status|force-restart>"
         exit 1
         ;;
 esac