replication: add remote peer connection timeout

We use coio_connect() to connect the replica to a remote peer. It
implies no timeout, and does a non-blocking connect() to the peer and
then waits for the socket to become writable indefinitely.

When the remote peer changes its IP address, connect() might try
connecting to the old address for as long as ~ 2 minutes (given the
default tcp_syn_retries value of 6).

This blocks replica from trying to reconnect to the updated address and
is pretty inconvenient.

Let's use coio_connect_timeout() instead and use
replication_disconnect_timeout() as a timeout, like everywhere else in
master-replica communication.

Closes #7294

NO_DOC=bugfix