log config changes as info messages
log config changes as info messages

Because it deserves to be seen by mere mortals.

Change-Id: I0c8591b1da804570aea583919c780a819cce385e
Reviewed-on: http://review.couchbase.org/15321
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

t3rm1n4l/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,ceejatec/ns_server,mschoch/ns_server,nimishzynga/ns_server,ceejatec/ns_server,mschoch/ns_server,ceejatec/ns_server,pavel-blagodov/ns_server,daverigby/ns_server,nimishzynga/ns_server,nimishzynga/ns_server,vzasade/ns_server,vzasade/ns_server,daverigby/ns_server,pavel-blagodov/ns_server,ceejatec/ns_server,vzasade/ns_server,membase/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,vzasade/ns_server,mschoch/ns_server,membase/ns_server,nimishzynga/ns_server,membase/ns_server,t3rm1n4l/ns_server,ceejatec/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,ceejatec/ns_server,membase/ns_server,daverigby/ns_server,membase/ns_server,membase/ns_server,pavel-blagodov/ns_server,daverigby/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,mschoch/ns_server,nimishzynga/ns_server