MB-100 Remove dump_parameters.

Parameters can be changed dynamically so it doesn't make sense to dump
them only once on xdc_rep_manager start.

Besides, all the #rep records are going to have a complete list of
parameters for the replication. And whenever replication gets
started, this record will be logged by standard erlang mechanisms.

Change-Id: I3b8f103960da708528050bebd59dc9566e0d8eeb
Reviewed-on: http://review.couchbase.org/28168
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>