Test cases for gswauth-cleanup-token

This commit creates a new class to validate the cleanup-token
& set-account-service CLI utility.This test tries to cover all the psossible values
that can be passed as user input valid/invalid.

Change-Id: Ia8ca40ca9e63a296b70cb999c6507b7b1ffbdf61
Signed-off-by: Pushpesh Sharma <psharma@redhat.com>
Reviewed-on: http://review.gluster.org/6759
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>