Merge branch 'leipert-upgrade-karma-ee' into 'master'

EE-Port of: gitlab-ce!21593

See merge request gitlab-org/gitlab-ee!7308

package.json

@@ -135,7 +135,7 @@
     "jasmine-core": "^2.9.0",
     "jasmine-diff": "^0.1.3",
     "jasmine-jquery": "^2.1.1",
-    "karma": "^2.0.4",
+    "karma": "^3.0.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-coverage-istanbul-reporter": "^1.4.2",
     "karma-jasmine": "^1.1.2",