ibverbs: rename provider-specific symbols to be "fi_ibv_*"

This clearly delineates between symbols here in this provider and
symbols that belong to libibverbs.

As a bonus side-effect, some provider symbols that began with "__"
(which are in the compiler's namespace) were eliminated.
include: direct_eq.h not direct_eq_domain.h

The direct file name for fi_eq.h should be fi_direct_eq.h,
not fi_direct_eq_domain.h

Signed-off-by: Sayantan Sur <sayantan.sur@intel.com>
Merge pull request #125 from sayantansur/direct-eq2

include: direct_eq.h not direct_eq_domain.h
Merge pull request #119 from jsquyres/topic/rename-ibv-to-fi_ibv

ibverbs: rename provider-specific symbols to be "fi_ibv_*"
verbs: rename "ibverbs" provider to be "verbs"

Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
Merge pull request #126 from jsquyres/topic/rename-ibverbs-to-verbs

verbs: rename "ibverbs" provider to be "verbs"