JCBC-380: Dynamically load ports from incoming config.

This changeset makes sure that the 8091 port is not hardcoded
during reconfigure, but loads and applies it dynamically
from the config that comes in from the cluster.

Change-Id: I4d06b9d80674069c1b46493777cbac4e476554a2
Reviewed-on: http://review.couchbase.org/30372
Reviewed-by: Deepti Dawar <deepti.dawar@globallogic.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>