Cleanup and deprecate -B option

The support for the ascii protocol was dropped a long time
ago. This commit cleans up the last few bits.

Change-Id: I80e22b2aa9aa78ca84e72b74cd9acf85b809bf68
Reviewed-on: http://review.couchbase.org/33074
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>