test: Add tar + bzip2 testsuite

Generate a pseudorandom tree of files, run tar cjf on it
to create referenced tarball, then run the same again on
the background, wait for a while, then checkpoint and restore
it and compare that two tarballs do not differ.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/app-emu/tarbz/run.sh

+#!/bin/bash
+
+crtools="../../../crtools"
+DEPTH=3
+SPAN=5
+archref="arch-ref.tar.bz2"
+archcr="arch.tar.bz2"
+
+rm -f ${archref}
+rm -f ${archcr}
+rm -rf tree/
+rm -rf dump/
+mkdir dump
+mkdir tree
+
+echo "Generating tree, depth ${DEPTH} span ${SPAN}"
+
+function gen_sub {
+	local dir="${1}"
+	local dep="${2}"
+
+	for i in $(seq 1 $SPAN); do
+		subdir="$dir/dir_$((RANDOM % 32))_$i"
+		subfl="$dir/file_$((RANDOM % 32))_$i"
+
+		mkdir "$subdir"
+		dd if=/dev/urandom of=$subfl bs=4096 count=$((RANDOM % 32 + 16)) > /dev/null 2>&1
+
+		if [ $dep -gt 0 ]; then
+			gen_sub "$subdir" $((dep - 1))
+		fi
+	done
+}
+
+gen_sub "./tree/" "$DEPTH"
+
+set -x
+
+time tar cjf ${archref} tree || exit 1
+
+setsid tar cjf ${archcr} tree &
+
+pid=${!}
+
+echo "Started tar in $pid background"
+sleep 3
+
+${crtools} dump -D dump -o dump.log -v 4 -t ${pid} || {
+	echo "Dump failed"
+	exit 1
+}
+
+echo "Dump OK, restoring"
+
+${crtools} restore -D dump -o restore.log -v 4 -t ${pid} || {
+	echo "Restore failed"
+	exit 1
+}
+
+echo "Finished, comparing tarballs"
+
+if ! cmp ${archref} ${archcr} ; then
+	echo "Archives differ"
+	echo "FAIL"
+else
+	echo "PASS"
+	rm -f ${archref}
+	rm -f ${archcr}
+	rm -rf tree/
+fi