MB-3845 - Improved rehabilitation of a born-again conn
MB-3845 - Improved rehabilitation of a born-again conn

It's possible that a conn_new() reuses a conn structure from the
freelist rather than from calloc().  Initialize the fields of that
recycled conn better.

Change-Id: Ib0f491106980f4648c0c60a1ab3c9c5af61a4486
Reviewed-on: http://review.membase.org/6265
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

zbase/moxi,membase/moxi,zbase/moxi,couchbase/moxi,membase/moxi,membase/moxi,membase/moxi,membase/moxi,couchbase/moxi,couchbase/moxi,zbase/moxi,zbase/moxi,membase/moxi,couchbase/moxi,zbase/moxi,couchbase/moxi,couchbase/moxi