ci - e2e+screens - add sleep to make sure ganache is ready

package.json

@@ -17,9 +17,9 @@
     "test:single": "cross-env METAMASK_ENV=test mocha --require test/helper.js",
     "test:integration": "npm run test:integration:build && npm run test:flat && npm run test:mascara",
     "test:integration:build": "gulp build:scss",
-    "test:e2e": "shell-parallel -s 'npm run ganache:start' -x 'npm run test:e2e:run'",
+    "test:e2e": "shell-parallel -s 'npm run ganache:start' -x 'sleep 3 && npm run test:e2e:run'",
     "test:e2e:run": "mocha test/e2e/metamask.spec --recursive",
-    "test:screens": "shell-parallel -s 'npm run ganache:start' -x 'npm run test:screens:run'",
+    "test:screens": "shell-parallel -s 'npm run ganache:start' -x 'sleep 3 && npm run test:screens:run'",
     "test:screens:run": "mocha test/screens/new.spec --recursive",
     "test:coverage": "nyc npm run test:unit && npm run test:coveralls-upload",
     "test:coveralls-upload": "if [ $COVERALLS_REPO_TOKEN ]; then nyc report --reporter=text-lcov | coveralls; fi",