CLOUDSTACK-2921: Fix the change service offering test on stoppedvm
CLOUDSTACK-2921: Fix the change service offering test on stoppedvm

There is no need to attach a volume to the VM when doing the
changeserviceOffering test. Condensed the test to verify that the VM's
offering is changed successfully when stopped and reflects when VM is
started.

Signed-off-by: Prasanna Santhanam <82219615980488abd2acc1a3d71cfb58f0b2b8b6@apache.org>
(cherry picked from commit 35492a3668f261d4dcf7b79e6cdabcb1f36483c6)

resmo/cloudstack,resmo/cloudstack,wido/cloudstack,resmo/cloudstack,jcshen007/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,GabrielBrascher/cloudstack,resmo/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,jcshen007/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,resmo/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,resmo/cloudstack,jcshen007/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack