Correctly raising MagnumServiceNotFound exception
Correctly raising MagnumServiceNotFound exception

Passed arguments in key value form, while raising
MagnumServiceNotFound exception, as expected by the exception
message.

Change-Id: Iae767db0bbd264bb668b2845284fc5d876f7025d
Closes-Bug: #1619225

ArchiFleKs/magnum,ArchiFleKs/magnum,openstack/magnum,openstack/magnum