Don't enable all stores by default

Glance currently enables all stores by default. This patch changes that
by removing all stores that require manual configuration and leaving
those that work right out of the box.

Current behavior causes a lot of confusion to users since most of those
stores print errors when they're not configured correctly. All extra
stores should be enabled explicitly by users.

This fix makes tests use http locations. All other locations besides the
default ones should be tested in their own test suites.

DocImpact
Closes-bug: #1255556
Change-Id: I82073352641d3eb2ab3d6e9a6b64afc99a30dcc7
Merge "Don't enable all stores by default"