LU-14036 build: fix lbuild for MOFED 5.1

LU-14036 build: fix lbuild for MOFED 5.1

Starting MOFED 5.1, rdma-core is required for libib*mad

Test-Parameters: trivial

Lustre-change: https://review.whamcloud.com/40254
Lustre-commit: 279721a9c7ea076bb8eab1f59ede53b09b9a5d07

Change-Id: Id26f3cdb0552933577e1b27384ac82f9f48e2b3a
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/41041
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>