Make some infiniband example utilities easily buildable:
- Add new Makefiles.
- Add more include directories when building.
- Fixed a printf() formatting string.

MFC after:	3 days
Sponsored by:	Mellanox Technologies


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273774 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f