EX-2908 build: include ucx when we build MOFED

EX-2908 build: include ucx when we build MOFED

openmpi depends on ucx

Change-Id: If0967a655c29003939758d1099f316fc02896fe2
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/43752
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
(cherry picked from commit fd1004074434f79d4086eca49e7eb5a326f58d0e)
Reviewed-on: https://review.whamcloud.com/43848