Remove unused lcb_t members: vb_server_map and nvbuckets

It should save us some memory per each lcb_t

Change-Id: Idf625f5d50a6ebeff105dd00d7872cb772316099
Reviewed-on: http://review.couchbase.org/30406
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
cbc: Allow to force SASL authentication mechanism

Change-Id: Icf06230f900ed9246e2905eedd60a708580d2ce8
libvbucket: Substitute localhost marker in the config

This marker might appear since server release 2.5 as part of CCCP

More info:
* http://review.couchbase.org/29996
* http://review.couchbase.org/30067

Change-Id: I2a27a89501dd72563f7aa7e7da911e174c4565a8
Extract function to dump config cache to disk

Change-Id: Ie33bbd8dda5c85c401ca4883630a54d0aff9de82
CCBC-234 Use CCCP protocol to update vbucket configuration

Change-Id: I1fb24cee6ad9c6c4c77f4ac9f192215b846fe488
CCBC-234 Add lcb_cntl command to determine source of configuration

Change-Id: I933558ffe4a20eedca6e03ee7bf3d2dfe0e11ab0
refactor configure structure

Change-Id: I1742b31089bfe5422b88a015b8891c4d20b57589