Remove NOOP in VVM connection

ImapFolder.open() is always called on a new instance. Using NOOP
to validate existing connection is never ran.

This CL removes the NOOP check and asserts open() is only called once
per instance.

Change-Id: I5b45f043707529783409915e1c1652d2a28f5911
Fixes: 27817300
1 file changed