Merge from projects/sendfile: extend protocols API to support
sending not ready data:
o Add new flag to pru_send() flags - PRUS_NOTREADY.
o Add new protocol method pru_ready().

Sponsored by:	Nginx, Inc.
Sponsored by:	Netflix


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275329 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Fix building of some infiniband utilities by updating some header file
locations and compiler include directives.

MFC after:	3 days
Sponsored by:	Mellanox Technologies


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275330 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f