test-runner: fix verbose arguments as single string

The verbose arguments come in from the QEMU command line as a
single string. This should have been split into an array immediately
but was not. This led to issues like hostapd debug being enabled
when "-v hostapd_cli" was passed in.

tools/test-runner

@@ -1212,6 +1212,9 @@ def run_tests():
 	if not args.debug:
 		sys.stdout = open(os.devnull, 'w')
 
+	if args.verbose != []:
+		args.verbose = args.verbose.split(',')
+
 	os.environ['PATH'] = '%s/src' % args.testhome
 	os.environ['PATH'] += ':%s/tools' % args.testhome
 	os.environ['PATH'] += ':%s/client' % args.testhome