Connection/application wizard: reconnects if you get back and forth to the connection page

What makes this necessary is the internal behaviour of the connection page being used when application- or import-wizard are launched from central or file-menu. It there is a delegating wizard page which invokes either v2 or v3 wizard based on the server type that the user is choosing. Behind the scenes I see the conn wizard connecting several times when launched from central/file-menu. The delegating wizard page needs to connect in the WizardPage#getNextPage(), a method that is also used in PageChangingListener(s) which it's using to determine the page change direction (forward or backward).

how to reproduce:

1. EXEC: launch application wizard
2. ASSERT: connection page shows up
3. EXEC: select an existing or create a new connection
4. EXEC: get to the next page
5. EXEC: get back to the connection page and hit "Next" again

Result:
You see the progress bar coming up and getting to the 2nd page again after some delay caused by the the wizard re-connecting.