Handoff exceeding the transfer limit should not throw an error #564
Description
Right now, when riak tries to handoff more than the limit allows, you get scary messages like this:
2014-03-25 16:49:58.988 [error] <0.142.0> Supervisor riak_core_handoff_sender_sup had child
riak_core_handoff_sender started with {riak_core_handoff_sender,start_link,undefined} at
<0.18847.7518> exit with reason max_concurrency in context child_terminated
Instead of exiting with max_concurrency, we should exit normal (possibly logging something to info/notice about exceeding the transfer limit). The supervisor has the children flagged as temporary anyway, so this will not impact retrying handoff later.