Update qa runtime env with new qa users

qa/qa/runtime/env.rb

@@ -145,6 +145,38 @@ module QA
         ENV['GITLAB_QA_PASSWORD_2']
       end
 
+      def gitlab_qa_username_3
+        ENV['GITLAB_QA_USERNAME_3'] || 'gitlab-qa-user3'
+      end
+
+      def gitlab_qa_password_3
+        ENV['GITLAB_QA_PASSWORD_3']
+      end
+
+      def gitlab_qa_username_4
+        ENV['GITLAB_QA_USERNAME_4'] || 'gitlab-qa-user4'
+      end
+
+      def gitlab_qa_password_4
+        ENV['GITLAB_QA_PASSWORD_4']
+      end
+
+      def gitlab_qa_username_5
+        ENV['GITLAB_QA_USERNAME_5'] || 'gitlab-qa-user5'
+      end
+
+      def gitlab_qa_password_5
+        ENV['GITLAB_QA_PASSWORD_5']
+      end
+
+      def gitlab_qa_username_6
+        ENV['GITLAB_QA_USERNAME_6'] || 'gitlab-qa-user6'
+      end
+
+      def gitlab_qa_password_6
+        ENV['GITLAB_QA_PASSWORD_6']
+      end
+
       def knapsack?
         !!(ENV['KNAPSACK_GENERATE_REPORT'] || ENV['KNAPSACK_REPORT_PATH'] || ENV['KNAPSACK_TEST_FILE_PATTERN'])
       end