sanitize revrpc log printouts

[ns_server:debug,2015-02-18T18:43:20.076,n_0@127.0.0.1:json_rpc_connection-projector-cbauth<0.328.0>:json_rpc_connection:handle_call:151]sending jsonrpc call:{[

{jsonrpc,<<"2.0">>}

,

{id,1}

,

{method,<<"AuthCacheSvc.UpdateDB">>}

,
{params,
[{[{nodes,
[{[

{host,<<"127.0.0.1">>}

,

{admin_user,<<"_admin">>}

,

{admin_pass, <<"3f4ecdb805ace899408aaf8b2ae027d6">>}

,

{ports,[9000,9500,12000,10000]}

,

{local,true}

]}]},
{buckets,{[]}},

{tokenCheckURL,<<"http://127.0.0.1:9000/_cbauth">>}

,
{admin,
{[

{user,<<"Administrator">>}

,

{salt,<<"I9F5iXO3WBFAJfSBOT/qUQ==">>}

,

{mac, <<"YN+//EvZ9HueVejP0Az8vLc88yw=">>}

]}}]}]}]}