tests: factor out common shell code to functions

Factor out shell code used in several tests to common functions.

* tests/fanotify_mark.expected: New file.
* tests/ioctl.expected: New file.
* tests/net-fd.expected: New file.
* tests/net.expected: New file.
* tests/statfs.expected: New file.
* tests/sun_path.expected: New file.
* tests/uio.expected: New file.
* tests/ipc.sh: New file.
* tests/Makefile.am (EXTRA_DIST): Add them.
* tests/init.sh (dump_log_and_fail_with, run_prog,
run_prog_skip_if_failed, run_strace, run_strace_merge,
match_awk, match_diff, match_grep): New functions.
* tests/*.test: Use them.
diff --git a/tests/strace-k.test b/tests/strace-k.test
index f757fb9..90d56dc 100755
--- a/tests/strace-k.test
+++ b/tests/strace-k.test
@@ -4,6 +4,9 @@
 
 . "${srcdir=.}/init.sh"
 
+$STRACE -h | grep '^-k' > /dev/null ||
+	skip_ 'strace -k is not available'
+
 # strace -k is implemented using /proc/$pid/maps
 [ -f /proc/self/maps ] ||
 	framework_skip_ '/proc/self/maps is not available'
@@ -11,27 +14,17 @@
 check_prog sed
 check_prog tr
 
-./stack-fcall ||
-	fail_ 'stack-fcall failed'
-
-$STRACE -h | grep '^-k' > /dev/null ||
-	skip_ 'strace -k is not available'
-
-args="-e getpid -k ./stack-fcall"
-$STRACE $args > $LOG 2>&1 || {
-	cat $LOG
-	fail_ "$STRACE $args failed"
-}
+run_prog ./stack-fcall
+run_strace -e getpid -k $args
 
 expected='getpid f3 f2 f1 f0 main '
-result=$(sed -n '1,/(main+0x[a-f0-9]\+) .*/ s/^.*(\([^+]\+\)+0x[a-f0-9]\+) .*/\1/p' $LOG |
+result=$(sed -n '1,/(main+0x[a-f0-9]\+) .*/ s/^.*(\([^+]\+\)+0x[a-f0-9]\+) .*/\1/p' "$LOG" |
 	tr '\n' ' ')
 
 test "$result" = "$expected" || {
-	cat $LOG
 	echo "expected: \"$expected\""
 	echo "result: \"$result\""
-	fail_ "unexpected output from $STRACE $args"
+	dump_log_and_fail_with "$STRACE $args output mismatch"
 }
 
 exit 0