Add a test for attaching 2 volumes to a server
Add a test for attaching 2 volumes to a server

In Newton development, we could not attach multiple volumes to a
single server. That seemed critical bug and it is good to block
such changes in the future.

Change-Id: Icdeafb5f30159205c89cb76a8d38399cefcb6127
Closes-Bug: #1633535

cisco-openstack/tempest,cisco-openstack/tempest,vedujoshi/tempest,openstack/tempest,vedujoshi/tempest,Juniper/tempest,masayukig/tempest,openstack/tempest,masayukig/tempest,Juniper/tempest