LU-12824 o2ib: Reintroduce kiblnd_dev_search

LU-12824 o2ib: Reintroduce kiblnd_dev_search

If we add an interface to multiple nets then we need to re-use the
struct ib_dev object for each of the nets.

Cray-bug-id: LUS-7935
Fixes: 75ab841 ("LU-11893 lnet: consoldate secondary IP address handling")
Test-Parameters: trivial
Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: I1790e24458f47d632fd137b78de076d408fe5260
Reviewed-on: https://review.whamcloud.com/36326
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>