Remove "test_create_with_nonexistent_volume_type"

This test is already implemented by "test_create_volume_with_nonexistent_volume_type"
in test_volumes_negative.py beyond that it doesn't require an admin privileges and
should be under "test_volumes_negative" file since the action that should be fail
is volume creation.

Change-Id: If17829d6690e994b8bcb60ccf48db99c47b32fa1
1 file changed