kunit: tool: Print UML command

As for the Qemu command, print the command used to run tests with UML.

Cc: Brendan Higgins <[e-mail]>
Cc: David Gow <[e-mail]>
Signed-off-by: Mickaël Salaün <[e-mail]>
Reviewed-by: David Gow <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/kunit/kunit_kernel.py

···
 		"""Runs the Linux UML binary. Must be named 'linux'."""
 		linux_bin = os.path.join(build_dir, 'linux')
 		params.extend(['mem=1G', 'console=tty', 'kunit_shutdown=halt'])
+		print('Running tests with:\n$', linux_bin, ' '.join(shlex.quote(arg) for arg in params))
 		return subprocess.Popen([linux_bin] + params,
 					   stdin=subprocess.PIPE,
 					   stdout=subprocess.PIPE,