Improve messaging connector param resources

The connector (and acceptor) resources accept param children that are used to store generic param (key/value pair) that are passed to HornetQ.

When a param is added, we could check that the name is in the acceptable set for the given resource netty/in-vm connector/acceptor (HornetQ provides this info) instead of waiting for HornetQ runtime to fail.

There may also be other improvements possible (resource transformations, resource descriptions, etc.)