CLOUDSTACK-3753 fixed the test test_non_contigiousvlan.py

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
CLOUDSTACK:3798: Removed wrong assert. Login was getting successful, assert was failing. Anyway it is being checked in the assert below for sesionKey

Signed-off-by: Prasanna Santhanam <tsp@apache.org>
CLOUDSTACK-4004: Fix attaching a newly allocated RBD image to an Instance

Signed-off-by: Wido den Hollander <wido@42on.com>
https://issues.apache.org/jira/browse/CLOUDSTACK-2685
minor edit