Adds suspend server extension for V3 API

Moves the suspend/resume server functionality out of admin_actions into
its own extension. This part of the blueprint v3-admin-actions-split
allows more selective enablement of features contained in the admin
actions extension.

Note that XML api samples are no longer generated because
bp remove-v3-xml-api has been approved.

Partially implements bp v3-admin-actions-split
DocImpact: Adds os-suspend-server extension and moves suspend/resume
functionality out of os-admin-actions into this new extension

Change-Id: Ie2ad1c6085d65fee397d6ad5b5c9f3bd8e82ad3c
Merge "Adds suspend server extension for V3 API"