Add 'make installcheck' rule to test installed packages.

Allow the tests to be run on the installed libguestfs.so library and
on installed programs (but not installed language bindings, yet).

To run the tests, you have to have a copy of the libguestfs source
tree with exactly the same version as the installed libguestfs.  You
have to build the libguestfs source tree.  Then you do:

  make installcheck

I investigated making automake 'make installcheck' work, but it's
basically broken (no surprise there).

This is derived from the old 'make-check-on-installed.pl'
script (which is also removed in this patch).

installcheck.sh.in

@@ -0,0 +1,107 @@
+#!/bin/bash
+# @configure_input@
+#
+# (C) Copyright 2015 Red Hat Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+# Run 'make check' on installed packages.
+#
+# The version of installed libguestfs being tested, and the version of
+# the libguestfs source tree must be the same.
+
+unset CDPATH
+export LANG=C
+set -e
+set -x
+
+# Grrrrrrr autoconf.
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+
+# Remove all libtool crappage.
+find -name 'lt-*' | grep '/.libs/lt-' | xargs -r rm
+
+# Copy the installed library into libtool directory.
+rm src/.libs/libguestfs.so*
+cp @libdir@/libguestfs.so* src/.libs/
+
+# Copy installed binaries into the right places.
+cp @bindir@/libguestfs-test-tool  test-tool/
+cp @bindir@/guestfish             fish/
+cp @bindir@/guestmount            fuse/
+cp @bindir@/virt-alignment-scan   align/
+cp @bindir@/virt-builder          builder/
+cp @bindir@/virt-cat              cat/
+cp @bindir@/virt-copy-in          fish/
+cp @bindir@/virt-copy-out         fish/
+cp @bindir@/virt-customize        customize/
+cp @bindir@/virt-dib              dib/
+cp @bindir@/virt-diff             diff/
+cp @bindir@/virt-df               df/
+cp @bindir@/virt-edit             edit/
+cp @bindir@/virt-filesystems      cat/
+cp @bindir@/virt-format           format/
+cp @bindir@/virt-get-kernel       get-kernel/
+cp @bindir@/virt-inspector        inspector/
+cp @bindir@/virt-ls               cat/
+cp @bindir@/virt-make-fs          make-fs/
+cp @libexecdir@/virt-p2v          p2v/
+cp @bindir@/virt-rescue           rescue/
+cp @bindir@/virt-resize           resize/
+cp @bindir@/virt-sparsify         sparsify/
+cp @bindir@/virt-sysprep          sysprep/
+cp @bindir@/virt-tar-in           fish/
+cp @bindir@/virt-tar-out          fish/
+cp @bindir@/virt-v2v              v2v/
+cp @bindir@/virt-win-reg          tools/
+
+# virt-list-filesystems, virt-list-partitions and virt-tar are not
+# tested, because they are not routinely installed by Linux distros
+# (being legacy programs).
+
+# XXX No language bindings are copied at the moment.
+
+# Copy the installed appliance.
+rm -rf appliance/supermin.d
+cp -r @libdir@/guestfs/supermin.d appliance/
+# Try to force the appliance not to get rebuilt:
+touch appliance/stamp-supermin
+rm -rf "tmp/.guestfs-$(id -u)"
+
+# Run the tests.
+make check
+
+# Check the library and some critical binaries didn't get rebuilt
+# during the 'make check', which would invalidate the results of
+# the test.
+compare () {
+    sum1=`md5sum $1 | @AWK@ '{print $1}'`
+    sum2=`md5sum $2 | @AWK@ '{print $1}'`
+    if [ "$sum1" != "$sum2" ]; then
+        echo "$2 was overwritten during the test.  Test results are invalid."
+        exit 1
+    fi
+}
+compare @libdir@/libguestfs.so src/.libs/libguestfs.so
+compare @bindir@/guestfish  fish/guestfish
+compare @bindir@/guestmount fuse/guestmount
+compare @bindir@/virt-df    df/virt-df
+compare @bindir@/virt-v2v   v2v/virt-v2v
+compare @libdir@/guestfs/supermin.d/daemon.tar.gz \
+                            appliance/supermin.d/daemon.tar.gz
+
+# Now do a make clean to remove all the above.
+make clean >/dev/null 2>&1 ||: