Fully qualify instance resource pages

With multi-region support it's necessary to use FQDNs for instance
resource pages rather than basic instance IDs. This change switches
all instance links to FQDNs as well as article creation and deletion.
This change also adds a maintenance script that will rename existing
articles from IDs to FQDNs.

Change-Id: I828c216b45ef8b56e579b0e0b378fbb0388ab240