Adds availability zone info to System Info panel

Also moves the host aggregates data into System Info panel
because it's exactly the type of static information that
belongs there, and it reduces a significant amount of
boilerplate.

Incidentally adds a new table feature to make listing
out unordered lists of items easier.

Implements blueprint show-zone-for-admin

Change-Id: Id8fb5c9615b018135a5d90eaa82eb80ff63bb7dc