Can't cancel the connection step when creating a remote server

[eharris369]

When creating a remote server after clicking on the Verify button it tries to connect. This attempts 10 iterations (timeout is 5000 and interval is 500), but each javax.management.remote.JMXConnector.connect() call takes about 30s and it does not check for cancel after each attempt so this can take a long time.

Fix the AbstractRemoteServerComposite.connect method to call the basic connect which does not take a time out and interval and do the looping itself, checking for cancel after each attempt (the progress monitor will need to be passed in).