configury: add some descriptive output messages in configure

Ensure that the ofi MTL and the usnic BTL have good descriptive output
messages in configure.

ompi/mca/mtl/ofi/configure.m4

@@ -2,6 +2,7 @@
 #
 # Copyright (c) 2013-2014 Intel, Inc. All rights reserved
 #
+# Copyright (c) 2014 Cisco Systems, Inc.  All rights reserved.
 # $COPYRIGHT$
 #
 # Additional copyrights may follow
@@ -22,11 +23,10 @@ AC_DEFUN([MCA_ompi_mtl_ofi_POST_CONFIG], [
 AC_DEFUN([MCA_ompi_mtl_ofi_CONFIG],[
     AC_CONFIG_FILES([ompi/mca/mtl/ofi/Makefile])
 
+    AC_MSG_CHECKING([for libfabric support])
     AS_IF([test $opal_common_libfabric_happy -eq 1],
-          [$1],
-          [$2])
-
-    # substitute in the things needed to build ofi
-    AC_SUBST([opal_common_libfabric_CPPFLAGS])
-    AC_SUBST([opal_common_libfabric_LIBADD])
+          [AC_MSG_RESULT([yes])
+           $1],
+          [AC_MSG_RESULT([no])
+           $2])
 ])dnl

opal/mca/btl/usnic/configure.m4

@@ -98,7 +98,7 @@ AC_DEFUN([_OPAL_BTL_USNIC_DO_CONFIG],[
     # (the common/ configury is guaranteed to come first).  So we can
     # simply check to see if libfabric setup was happy.
     AS_IF([test "$btl_usnic_happy" = "yes"],
-          [AC_MSG_CHECKING([if building embedded libfabric])
+          [AC_MSG_CHECKING([if building embedded libfabric with usnic provider])
            AS_IF([test $opal_common_libfabric_happy -eq 1 && \
                   test $opal_common_libfabric_usnic_happy -eq 1 && \
                   test $opal_common_libfabric_build_embedded -eq 1],