LU-13571 lnd: Use NETWORK_TIMEOUT for some conn failures

LU-13571 lnd: Use NETWORK_TIMEOUT for some conn failures

For -EHOSTUNREACH and -ETIMEDOUT we cannot tell whether the
connnection failure was due to a problem with the remote or local NI,
so we should return the LNET_MSG_STATUS_NETWORK_TIMEOUT to LNet in
these cases.

HPE-bug-id: LUS-9342
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I9036f5698061ce74fe29683b8249b8f9a05f3433
Reviewed-on: https://review.whamcloud.com/39900
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>