xpmem: fix mapping of attachment and segment

* Mapping attached part of segment is done at attach time instead of
  make time to work with runtimes (e.g. OpenMPI) xpmem_make-ing the
  entire user-space
* Mapping attached part of segment at attach time can be turned off by
  specifying xpmem_remote_on_demand in kernel argument
* Mapping attachment chooses appropriate page-sizes, i.e., largest
  allowed by memory range and segment page boundary

Fixes: a8696d8 "xpmem: Support large page attachment"
Change-Id: I44663865204036520e5f62fe22b9134ee4629f9b

test/issues/1473/okng.h

@@ -0,0 +1,32 @@
+#ifndef __OKNG_H_INCLUDED__
+#define __OKNG_H_INCLUDED__
+
+#include <stdio.h>
+
+#define _OKNG(verb, jump, cond, fmt, args...) do {		\
+	if (cond) {						\
+		if (verb)					\
+			printf("[  OK  ] " fmt, ##args);	\
+	} else {						\
+		printf("[  NG  ] " fmt, ##args);		\
+		if (jump) {					\
+			ret = 1;				\
+			goto out;				\
+		}						\
+	}							\
+} while (0)
+
+#define OKNG(args...) _OKNG(1, 1, ##args)
+#define INFO(fmt, args...) printf("[ INFO ] " fmt, ##args)
+#define START(fmt, args...) printf("[ START] " fmt, ##args)
+#define INTERR(cond, fmt, args...) do {	 \
+	if (cond) {			 \
+		char msg[4096];			 \
+		sprintf(msg, fmt, ##args);		 \
+		printf("[INTERR] %s:%d %s", __FILE__, __LINE__, msg);	\
+		ret = 1;					\
+		goto out;					\
+	} \
+} while (0)
+
+#endif