Follow up to "Adapt gerrit.sh script to work on Alpine Linux"

Issue:
Older centos linux distros don't return all pids when simple 'ps' is
called and as a result gerrit's PID is not listed and cannot be found
by the following 'grep'. It result in the situation when gerrit.sh is
not properly handling start/stop commands.

Solution:
Add 'ax' parameter so that 'ps' returns all pids. It was successfully
tested with centos and alpine 3.9.4 e.g.:
  bash-4.4# echo "$PID"
  62
  bash-4.4# ps ax -o pid | grep -w $PID
     62

Change-Id: I43596f0449f0d357dc640e582381210b61e4ca2d
Signed-off-by: Jacek Centkowski <jcentkowski@collab.net>

gerrit-pgm/src/main/resources/com/google/gerrit/pgm/init/gerrit.sh

@@ -63,7 +63,7 @@ test $# -gt 0 || usage
 running() {
   test -f $1 || return 1
   PID=`cat $1`
-  ps -o pid | grep -w $PID >/dev/null 2>/dev/null || return 1
+  ps ax -o pid | grep -w $PID >/dev/null 2>/dev/null || return 1
   return 0
 }