Make add-connector and remove-connector in jmx subsystem follow the normal add/remove pattern

JMX has the following ops

/subsystem=jmx:add-connector(name=xxx,......)
/subsystem=jmx:remove-connector(name=xxx)

I'd like to move these to fit the normal add/remove pattern, e.g.

/subsystem=jmx/connector=xxx:add(...)
/subsystem=jmx/connector=xxx:remove