net/activemq: update to 5.18.1

Reporter becomes maintainer. Already maintainer of some ports.

Makefile:

• Bumped to version 5.18.1
• Added maintainer information
• Specified version of openJDK to use
• Updated initial audit.log and activemq.log to match thoses set in /etc/rc.conf
• Removed .orig file deletion of non-existant file

distinfo:

• Updated checksum for new distfile

files/activemq: (activemq rc.d startup file)

• Added explict JAVA_HOME path to use, and defaulted to java/openjdk18
• Added rc.conf tunable to allow the full java command to be echoed on stdout on service start (debuging for people not so familiar with activemq and how it is envoked)
• Added audit logging to be turned on by default, with explaination in rc file.
• Added Jolokia configuration file path to activemq invokation, supressing null pointer error on start-up

PR: 271100
Reported by: james@elstone.net