modify params transfer mode in test_snapshot_manage
modify params transfer mode in test_snapshot_manage

In test_snapshot_manage, when use list_snapshot, the params is wrong
used.

Change-Id: I7567b0aa15cab851ea15da56b214cbdddcfdada1
Closes-bug: #1740811

cisco-openstack/tempest,cisco-openstack/tempest,openstack/tempest,masayukig/tempest,masayukig/tempest,openstack/tempest