log ns_config loading better
log ns_config loading better

As requested by Perry Krug.

So that we're clearly seeing config loading errors and pathes that are
used.

Change-Id: I43c94accfc153b6e1b01ae2701f23d12704dc4a2
Reviewed-on: http://review.couchbase.org/15320
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

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