Allow javaArgs for all Zowe Java processes

[nigelvwilliams]

Customers who wish to monitor the JVMs in Zowe, say with OMEGAMON for JVM cannot easily add Java Arguments to the Java configuration.

Describe the experience you'd like
Currently only the Message Service JVM has a javaArgs yaml field. We'd like all the Java process to have that option.

Describe alternatives you've considered
Manually altering the template arguments, but they may get overwritten by maintenance.