MDL-49456 behat: Fixed following issues in parallel run

1. Parallel run without feature should exit with success
2. Updated exit codes to be more clear for each process
3. Fixed wwwroot and dataroot while executing with tags
4. Added support for running scenario/feature
5. Added support for or'ing tags
6. Added support for running single behat site
7. Fixed wrong example in help
8. Use parallel run only when parallel > 1
9. Exit showing behat site is not installed
10. Exit with error, if not a valid option
11. Added usage in help to explain how to use command
12. run.php should be able to run from any path
13. Pass all arguments to single run

admin/tool/behat/cli/init.php

@@ -59,6 +59,9 @@ list($options, $unrecognized) = cli_get_params(
 $help = "
 Behat utilities to initialise behat tests
 
+Usage:
+  php init.php [--parallel=value [--maxruns=value] [--fromrun=value --torun=value]] [--help]
+
 Options:
 -j, --parallel Number of parallel behat run to initialise
 -m, --maxruns  Max parallel processes to be executed at one time.
@@ -82,7 +85,7 @@ if (!empty($options['help'])) {
 $utilfile = 'util_single_run.php';
 $paralleloption = "";
 // If parallel run then use utilparallel.
-if ($options['parallel']) {
+if ($options['parallel'] && $options['parallel'] > 1) {
     $utilfile = 'util.php';
     $paralleloption = "";
     foreach ($options as $option => $value) {