openstack: block: add unit test for os-detach
openstack: block: add unit test for os-detach

Add a unit test for os-detach api.

Signed-off-by: Kristen Carlson Accardi <047ff8258f0113ece56e5e2fe9e0d987b14c4333@linux.intel.com>

mrkz/ciao,mcastelino/ciao,ciao-project/ciao,leoswaldo/ciao,01org/ciao,leoswaldo/ciao,ciao-project/ciao,mcastelino/ciao,wcwxyz/ciao,mrkz/ciao,kaccardi/ciao,mrkz/ciao,markdryan/ciao,erick0z/ciao,matthewrsj/ciao,wcwxyz/ciao,jorgevgut/ciao,tpepper/ciao,rbradford/ciao,jorgevgut/ciao,obedmr/ciao,leoswaldo/ciao,matthewrsj/ciao,erick0z/ciao,obedmr/ciao,mcastelino/ciao,obedmr/ciao,01org/ciao,tpepper/ciao,tpepper/ciao,matthewrsj/ciao,erick0z/ciao,rbradford/ciao,wcwxyz/ciao,jorgevgut/ciao,markdryan/ciao,kaccardi/ciao