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_*"
man: Remove size field from fi_info description

The size field is no longer part of fi_info.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
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"
Link to librt

Needed for clock_gettime

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Merge pull request #129 from shefty/master

Fixup man page and build
Enable modular building of selected providers, disabled by default.

0, 1, 2, or 3 (all) providers can be built as loadable.
Any combination of loadable/built-in/not built should work, ie:

$ # build into libfabric.so: psm, sockets
$ # dlopen: libibverbs-fi.so, $libdir/libfabric/*fi.so
$ ./configure –enable-verbs=dl

$ # build libfabric.so: nothing
$ # dlopen: lib{sockets,psm,ibverbs}-fi.so, $libdir/libfabric/*fi.so
$ ./configure –enable-verbs=dl --enable-sockets=dl --enable-psm=dl

$ # everything built in as normal
$ # dlopen: $libdir/libfabric/*fi.so, if exists
$ ./configure

This patch also factors utility functions (used by the providers but
not exported as part of the public API) into src/common.c, which is
built and linked into libfabric.so and also in any modular-built providers.
Merge pull request #112 from pmmccorm/master

Enable modular building of selected providers, disabled by default.