Case 27790;Changed command so any behat parameter can be used

Author: guardiola86

chain/chain-site-test.yml

@@ -1,4 +1,4 @@
-# Usage: drupal site:test --placeholder="name:subscriptions" --placeholder="root:/vagrant/repos" --placeholder="tags:tags"
+# Usage: drupal site:test --placeholder="name:subscriptions" --placeholder="root:/vagrant/repos" --placeholder="behat_params:--tags=bannerimage"
 command:
   name: site:test
   description: 'Sets the test suites up and then runs them.'
@@ -14,7 +14,7 @@ commands:
 # Run Behat
   - command: exec
     arguments:
-      bin: 'cd %{{root|/vagrant/repos}}/%{{name}}/tests; ./behat --tags="%{{tags}}";'
+      bin: 'cd %{{root|/vagrant/repos}}/%{{name}}/tests; ./behat %{{behat_params|-n}};'
 # Run phpunit
   - command: exec
     arguments: