Overhaul jvm debug settings

[jvalkeal]

Currently what you can do is something like:

deployer.time.local.debugPort=8888
deployer.time.local.debugSuspend=n
deployer.log.local.debugPort=8889
deployer.log.local.debugSuspend=n

This has so many issues starting from a fact that each instance(if you deploy more than one) simply gets debug port by summing instance id. i.e. for time instance 0 it gets 8888 and instance 1 gets 8889. Then obviously first instance of log would fail as port is already in use. Behaviour is probably not documented at all.

Other thing is that these ports are not exposed anywhere other that what dataflow exposes as deployment properties. So it's impossible to know from dataflow rest api if debug was enabled for a particular instance and what was a port it was tried to assign. I think these debug settings needs to be exposed via runtime parameters so that we can query what is a possible debug target for a running app instances.