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/common.sh.in

@@ -0,0 +1,19 @@
+#!/usr/bin/sh
+
+# define WORKDIR expecting this script is on <autotest>/data/scripts/
+SCRIPT_PATH=$(readlink -m "${BASH_SOURCE[0]}")
+AUTOTEST_HOME="${SCRIPT_PATH%/*/*/*/*}"
+if [[ -e ${AUTOTEST_HOME}/bin/config.sh ]]; then
+    . ${AUTOTEST_HOME}/bin/config.sh
+else
+    WORKDIR=$(pwd)
+fi
+
+arch=`uname -p`
+if [ -f @CMAKE_INSTALL_PREFIX@/etc/${arch}.conf ]; then
+	. @CMAKE_INSTALL_PREFIX@/etc/${arch}.conf
+else
+	echo "unknown arch: $1"
+	exit 1
+fi
+