MDL-39232 behat: Adding @_only_local tag

Tests which requires files to be uploaded should
be tagged as @_only_local.

badges/tests/behat/add_badge.feature

@@ -1,4 +1,4 @@
-@badges
+@badges @_only_local
 Feature: Add badges to the system
   In order to give badges to users for their achievements
   As an admin

badges/tests/behat/award_badge.feature

@@ -1,4 +1,4 @@
-@award_badges
+@award_badges @_only_local
 Feature: Award badges
   In order to award badges to users for their achievements
   As an admin

cohort/tests/behat/add_cohort.feature

@@ -44,7 +44,7 @@ Feature: Add cohorts of users
     And the "Current users" select box should not contain "Forth User (forth@user.com)"
 
   @javascript
-  Scenario: Add users to a cohort uploading a users file
+  Scenario: Add users to a cohort using a bulk user action
     When I follow "Bulk user actions"
     And I select "Third User" from "Available"
     And I press "Add to selection"

cohort/tests/behat/upload_cohort_users.feature

@@ -1,4 +1,4 @@
-@admin @cohorts
+@admin @cohorts @_only_local
 Feature: Upload users to a cohort
   In order to quickly fill site-wide groups with users
   As a moodle admin