ktest: Make the signal to terminate the console configurable

Currently ktest sends SIGINT to terminate the console.
 However, there are consoles which do not exit by this signal, for example,
 in my case, "virsh console <guest OS>". In such case, ktest is blocked in
 close_console(). It prevents this automate test.

This patch adds new option CLOSE_CONSOLE_SIGNAL which mean the
signal to terminate the console. Since its default value is "INT",
the original behavior isn't changed.

Link: http://lkml.kernel.org/r/87zjol8pl5.wl%satoru.takeuchi@gmail.com

Signed-off-by: Satoru Takeuchi <satoru.takeuchi@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

tools/testing/ktest/ktest.pl

@@ -25,6 +25,7 @@ my %default = (
     "TEST_TYPE"			=> "build",
     "BUILD_TYPE"		=> "randconfig",
     "MAKE_CMD"			=> "make",
+    "CLOSE_CONSOLE_SIGNAL"	=> "INT",
     "TIMEOUT"			=> 120,
     "TMP_DIR"			=> "/tmp/ktest/\${MACHINE}",
     "SLEEP_TIME"		=> 60,	# sleep time between tests
@@ -163,6 +164,7 @@ my $timeout;
 my $booted_timeout;
 my $detect_triplefault;
 my $console;
+my $close_console_signal;
 my $reboot_success_line;
 my $success_line;
 my $stop_after_success;
@@ -285,6 +287,7 @@ my %option_map = (
     "TIMEOUT"			=> \$timeout,
     "BOOTED_TIMEOUT"		=> \$booted_timeout,
     "CONSOLE"			=> \$console,
+    "CLOSE_CONSOLE_SIGNAL"	=> \$close_console_signal,
     "DETECT_TRIPLE_FAULT"	=> \$detect_triplefault,
     "SUCCESS_LINE"		=> \$success_line,
     "REBOOT_SUCCESS_LINE"	=> \$reboot_success_line,
@@ -1296,7 +1299,7 @@ sub close_console {
     my ($fp, $pid) = @_;
 
     doprint "kill child process $pid\n";
-    kill 2, $pid;
+    kill $close_console_signal, $pid;
 
     print "closing!\n";
     close($fp);