LU-1434 utils: Update Makefile to work out of the box

LU-1434 utils: Update Makefile to work out of the box

Add ability to install plugins into user's home directory if not root.
Build using pkg-config for wireshark.

Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: I5b3f5d6df7e5f1de9681645f7f2f4d01800b40cd
Reviewed-on: http://review.whamcloud.com/4851
Tested-by: Hudson
Reviewed-by: Doug Oucharek <doug.s.oucharek@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>