[dvs] Use DB namespace to construct DVSDatabase objects

[daall]

Signed-off-by: Danny Allen [email protected]

What I did I updated the DVSDatabase to refer to DBs by name and depend on the database config as opposed to manually providing the IDs and redis socket path.

Why I did it This is the preferred way of addressing databases now, and it's also a much cleaner abstraction than ID/redis socket.

How I verified it Re-ran the tests w/ this change. Also verified that concurrent tests work as expected.

Details if related

[daall]

retest this please