Cleans up marconi-queues and marconi-proxy config files

Changes [proxy:config] and [queues:config] into
just [drivers] since both these projects are
separate and so there's less repetition.

Change-Id: I982b5a08ed45426df17d9008854853c68c207608
Closes-Bug:#1231669
Remove proxy code

As discussed in one our meetings, the proxy code has been deprecated in
favor of the new sharding work. This patch removes all the code related
to the proxy.

Partially-implements bp storage-sharding

Change-Id: I6622332707c5a53ab56fa2796bef73be9e8c8c49