Added watchdog property key and flavor-key info

Added hw_watchdog_action property key and
watchdog info for flavor_key section (plus
minor edits). Added note about authorized
users, and reference to the page in the
Admin User Guide.

Closes-bug: #1287406
Closes-bug: #1287450

Change-Id: Ib404d98ce504883ae22733f681e205c641720f5a
Install guide: add a cinder-verify section

Describe how the Block Storage service can be tested after installation
(volume creation).

Closes-Bug: #1308370
Change-Id: If9d589c2afcdce13f33d53a27c18526ff3f6b90e
Merge "Added watchdog property key and flavor-key info"
Merge "Install guide: add a cinder-verify section"