Make os-services API extensions consistent with Nova

Updates the os-services API extensions to match the Nova changes
proposed in I932160d64fdd3aaeb2ed90a092ecc7a36dcc9665.

Resolves bug 1147746.

Change-Id: Ib0f24dea8e937a8e1a1604b1cbf19d96bcdbcd8f
Merge "Make os-services API extensions consistent with Nova"