Install oslo.db from source

Add oslo.db to the list of Oslo libraries we install from source.

Change-Id: Ie97ab6bfac19fbce9aeda5a96c6d7a805dfa6c35
Merge "Install oslo.db from source"
Merge commit 'refs/changes/83/86083/2' of git://gold.eng.hq.xensource.com/git/github/openstack-dev/devstack into tmpbranch