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B1D - src any, local dst, nmr dst

find peer_ni using dst_nid
- If this is a resend and peer_ni is unhealthy fail the send
- If this is an original send, then use the peer_ni even if it's not healthy.
select the best_ni to send from by going through all the local nis that can reach the dst_nid
- consider local_ni health in the selection by selecting the local_ni with the best health value.
- If this is a resend do not select a local_ni that has already been used.
send over that path

(Olaf) I'm thinking along these lines:

find peer_ni using dst_nid (non-MR, so this is the only peer_ni candidate)
- no issue if peer_ni is healthy
- try this peer_ni even if it is unhealthy if this is the 1st attempt to send this message
- fail if resending to an unhealthy peer_ni
pick the preferred NI for this peer_ni if set
- otherwise pick a healthy local NI and make it the preferred NI for this peer_ni
send over this path

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