BUG/MINOR: don't start haproxy on reload

If haproxy is not already running, reload should not start it.
Unfortunately the LSB spec does not explicitly cover this case:

  http://refspecs.linuxbase.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html

but it seems like the more correct behaviour, and actually fixes a
real-world issue we saw in SUSE Cloud.

Signed-off-by: Adam Spiers <aspiers@suse.com>

examples/haproxy.init

@@ -78,6 +78,10 @@ restart() {
 }
 
 reload() {
+  if ! [ -s $PIDFILE ]; then
+    return 0
+  fi
+
   quiet_check
   if [ $? -ne 0 ]; then
     echo "Errors found in configuration file, check it with '$BASENAME check'."