AMQ-6930 provide options to allow stdout/stderr of activemq process to be redirect to a file using append mode

assembly/src/release/bin/activemq

@@ -334,7 +334,7 @@ invokeJar(){
               -Dactivemq.conf=\"${ACTIVEMQ_CONF}\" \
               -Dactivemq.data=\"${ACTIVEMQ_DATA}\" \
               $ACTIVEMQ_CYGWIN \
-              -jar \"${ACTIVEMQ_HOME}/bin/activemq.jar\" $COMMANDLINE_ARGS >/dev/null 2>&1 &
+              -jar \"${ACTIVEMQ_HOME}/bin/activemq.jar\" $COMMANDLINE_ARGS >> $ACTIVEMQ_OUT 2>&1 &
               RET=\"\$?\"; APID=\"\$!\";
               echo \$APID > "${PIDFILE}";
               echo \"INFO: pidfile created : '${PIDFILE}' (pid '\$APID')\";exit \$RET" $DOIT_POSTFIX

assembly/src/release/bin/env

@@ -19,7 +19,7 @@
 # Configuration file for running Apache Active MQ as standalone provider.
 #
 # This file overwrites the predefined settings of the sysv init-script.
-# You can also use alternate location for default settings -  
+# You can also use alternate location for default settings -
 # invoke the init-script without a argument an review help section "Configuration of this script"
 # /etc/default/activemq <activemq user home>/.activemqrc <activemq installation dir>/bin/env
 
@@ -37,6 +37,10 @@ if [ -z "$ACTIVEMQ_OPTS" ] ; then
     ACTIVEMQ_OPTS="$ACTIVEMQ_OPTS_MEMORY -Djava.util.logging.config.file=logging.properties -Djava.security.auth.login.config=$ACTIVEMQ_CONF/login.config"
 fi
 
+if [ -z "$ACTIVEMQ_OUT" ]; then
+   ACTIVEMQ_OUT="/dev/null"
+fi
+
 # Uncomment to enable audit logging
 #ACTIVEMQ_OPTS="$ACTIVEMQ_OPTS -Dorg.apache.activemq.audit=true"