LU-56 lnet: code cleanup for lib-move.c

LU-56 lnet: code cleanup for lib-move.c

Most changes in this patch are just code cleanup:
- remove one unnecessary lock dance for message forwarding
- move some code blocks to make functions cleaner
- rename lnet_ni_peer_alive to lnet_ni_query_locked

It's an intermediate patch LNet SMP improvements.

Signed-off-by: Liang Zhen <liang@whamcloud.com>
Change-Id: Ia7cfe37a5a4f896be4fcc7f6c5cf9c27268de9ba
Reviewed-on: http://review.whamcloud.com/3048
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Doug Oucharek <doug@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>