fd_link Makefile: Added "check" targets to Makefile

"check" targets were added as they are required for top level Makefile.

Change-Id: Ia8c5eca88af2643fbaa3e09670077b094e4006ed
Reviewed-by: Mark D. Gray <mark.d.gray@intel.com>
Signed-off-by: Anthony Fee <anthonyx.fee@intel.com>
Vhost devices: Only init when devices used

At the moment userspace vhost is initialised even if vhost devices are
not being used. This patch only initialises vhost if the user passes
the "-h" option to ovs_dpdk. This has been tested with and without vhost
devices.

Change-Id: I40a08e0a5c32a9a8b9e1cb9b92c4f3c86ce27899
Reviewed-by: Mark D. Gray <mark.d.gray@intel.com>
Signed-off-by: Anthony Fee <anthonyx.fee@intel.com>
Merge "Vhost devices: Only init when devices used" into development