Allow customization of logo link

Adding code to allow logo link at the top of the navigation panel
to be configurable.

Close-bug: #1245630

Change-Id: Id5880d3b4fae1ce2d1d8821cc5cf3b2184ea11c9
Show AZ for instances

Display availability zone of an instance in the
instances table and the details page.

Fixes bug #1247251

Change-Id: Idd9165022ac149208f1860758989ef9ce5acb10e
Merge "Allow customization of logo link"
Merge "Show AZ for instances"