LU-12381 ko2iblnd: ignore down interfaces

LU-12381 ko2iblnd: ignore down interfaces

The for_each_netdev() loop in kiblnd_create_dev() scans for all
network devices on a system. Currently the code exit when an
network device is down but the device could be something besides
an IB device. Instead of exiting just ignore any device that is
down.

Test-Parameters: trivial

Fixes: c4b39bf56bbc ("LU-11893 o2iblnd: add secondary IP address handling")
Change-Id: I0a3bf808d849cd00711b6ef2e4e5bbd876b64903
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/35098
Tested-by: Jenkins
Reviewed-by: Chris Horn <hornc@cray.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>