Return a more descriptive error code if a proxy_get link is down

[bookshelfdave]

[bookshelfdave]

From @reiddraper: is there also a way to differentiate between 'not connected' and 'these two DCs aren't even configured to replicated to each other in this direction'?

[reiddraper]

Here's how I traced this, from Riak CS -> back up the chain,

riak_repl_pb_api.erl

riak_pb_codec

I know @metadave had done some tracing from the opposite end, on the repl side.

[bookshelfdave]

https://github.com/basho/riak_repl/blob/master/src/riak_repl_pb_get.erl#L101

https://github.com/basho/riak_repl/blob/master/src/riak_repl_pb_get.erl#L84

[cmeiklejohn]

Moving to 2.1