PATCH: Job Steps Segfault (Remote connection)

Looks like - no one has tested job's step creation for remote servert

While generating the updated screen-shots for the pgAdmin3 by Akshay, he found this bug.

Scenario:

- Create a new job

- Open the dialog to generate the job's step.

- Selection "Connection Type" as "Remote"

- Click the button to generate the connection string

This result in to the segment fault, because of the relavent changes for the server grouping has not been done here.

Please find the patch to resolve the issue.

Thanks Akshay for pointing out this bug...
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