Fix parameter of nova v3 flavors API

A parameter "OS-FLV-EXT-DATA:ephemeral" should be modified to "ephemeral"
with nova v3 API.

Change-Id: I5ca504ddd37acb81f2e7da3d36df01472780b992
Closes-bug: #1269252
Fix host_update test case for losing essential parameter

test_update_host_with_non_admin_user() test case doesn't
set 'status' and 'maintenance_mode' parameters which must
be set at least one.
And the test should only check admin privilege as the test
name, but current test contains other negative factor also.
This patch removes the factor by adding the parameters.

Closes-Bug #1269254

Change-Id: Ib582513629ffa9bcdc8a723e1ec9c36fbdd78591
Merge "Fix host_update test case for losing essential parameter"
Merge "Fix parameter of nova v3 flavors API"