XWIKI-11377: Add ability to monitor/manage the Jetty instance through JMX

* Removed unnecessary -Dcom.sun.management.jmxremote system property (was needed only on JDK 1.7.0_25 which apparently has a bug on Mac)

xwiki-platform-tools/xwiki-platform-tool-jetty/xwiki-platform-tool-jetty-resources/src/main/resources/start_xwiki.sh

@@ -37,7 +37,7 @@ usage() {
   echo "-sp, --stopport: The Jetty stop port to use. Overrides any value from JETTY_STOP_PORT. Defaults to 8079."
   echo "-ld, --lockdir: The directory where the executing process id is stored to verify that that only one instance"
   echo "    is started. Defaults to /var/tmp."
-  echo "-j, --jmx: Allows monitoring the Jetty server with a JMX console (such as jconsole)."
+  echo "-j, --jmx: Allows monitoring/managing Jetty through JMX."
   echo ""
   echo "Example: start_xwiki.sh -p 8080 -sp 8079"
 }
@@ -96,7 +96,6 @@ while [[ $# > 0 ]]; do
       shift
       ;;
     -j|--jmx)
-      XWIKI_OPTS="$XWIKI_OPTS -Dcom.sun.management.jmxremote"
       JETTY_OPTS="$JETTY_OPTS --module=jmx"
       ;;
     -h|--help)

xwiki-platform-tools/xwiki-platform-tool-jetty/xwiki-platform-tool-jetty-resources/src/main/resources/start_xwiki_debug.sh

@@ -36,7 +36,7 @@ usage() {
   echo "-sp, --stopport: The Jetty stop port to use. Overrides any value from JETTY_STOP_PORT. Defaults to 8079."
   echo "-ld, --lockdir: The directory where the executing process id is stored to verify that that only one instance"
   echo "    is started. Defaults to /var/tmp."
-  echo "-j, --jmx: Allows monitoring the Jetty server with a JMX console (such as jconsole)."
+  echo "-j, --jmx: Allows monitoring/managing Jetty through JMX."
   echo "-yp, --yourkitpath: The path where Yourkit can find the agent. If not passed then YourKit won't be enabled."
   echo "    For example: \"/Applications/YourKit Java Profiler 7.0.11.app/bin/mac\""
   echo "    or \"/home/User/yjp-11.0.8/bin/linux-x86-64/\""
@@ -100,7 +100,6 @@ while [[ $# > 0 ]]; do
       shift
       ;;
     -j|--jmx)
-      XWIKI_OPTS="$XWIKI_OPTS -Dcom.sun.management.jmxremote"
       JETTY_OPTS="$JETTY_OPTS --module=jmx"
       ;;
     -yp|--yourkitpath)