Raise timeout for gen_fsm:sync_send_event within riak-repl connections logic [JIRA: RIAK-2236]

[bsparrow435]

The 2ms timeout used here[1] is regularly hit at customer sites even when the workers are connected. We should increase this timeout to still allow for fast failure on disconnect but success even if the workers are slow to respond.

[1] https://github.com/basho/riak_repl/blob/develop/src/riak_repl_console.erl#L314