Add an extension to show the type of an ip.

There is currently no way to differentiate a fixed ip from a floating
ip in the servers list. This extension adds the OS-EXT-IPS:type param
so that users can determine if it is a fixed address or a floating
address.

Fixes bug 1117784

DocImpact

Change-Id: I8709a4f2f6792faa3d8e0cdcd330d751ef6633ae
Simplify and optimize az server output extension.

Displaying two different az results to users is confusing, so just
return the az that the instance is actually in. Also, cache the
result from looking up the az by host for an hour to avoid making
lots of expensive db requests.

DocImpact

Change-Id: Ib39bf94c608874695aab00e61035e64f9594a985
Merge "Add an extension to show the type of an ip."
Merge "Simplify and optimize az server output extension."