Close config connection before trying next node

It will fix asserts in case of the config node becomes unresponsive,
and the threshold controlled by LCB_CNTL_CONFERRTHRESH and  lcb_cntl

Change-Id: If15cdc59278054798b778b908fb8ab422d8eebf5
Reviewed-on: http://review.couchbase.org/28873
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Randomize supplied nodes list by default

Change-Id: Ie65c0e76fa8601d9df28652206149dc47cddd4be
Reviewed-on: http://review.couchbase.org/28890
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Update metadata for 2.1.3 release

Change-Id: Ie3197ba60c12e306a5d5731d4082319366ff899d
Reviewed-on: http://review.couchbase.org/28881
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>