Added implementation of sendmsg/recvmsg/inject for usdf dgram ep.

Currently sendmsg/recvmsg just directly call their counterparts for
sendv/recvv. Code need to be added to handle different flags such
as FI_COMPLETION/FI_INJECT and so on.

Also fixed some whitespace errors.

Signed-off-by: Xuyang Wang <xuywang@cisco.com>
Fix warnings in sockets-provider (Fixes #427)

Signed-off-by: Jithin Jose <jithin.jose@intel.com>
Merge pull request #439 from xuywang/pr/dgram_inject

Added implementation of sendmsg/recvmsg/inject for usdf dgram ep.
Merge pull request #440 from jithinjosepkl/pr/sockets

Fix warnings in sockets-provider (Fixes #427)
Makefile.am: include prov.h and usdf_rudp.h in the tarball

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>