Improved android e2e tests stability

Summary:
Some tweaks to make CircleCI pass
Closes https://github.com/facebook/react-native/pull/8425

Differential Revision: D3485087

Pulled By: bestander

fbshipit-source-id: b1941ecedbcaf81f0bcb34a10686f21f2ded3114

circle.yml

@@ -77,7 +77,7 @@ test:
     - ./gradlew :ReactAndroid:assembleDebugAndroidTest -Pjobs=1 -Pcom.android.build.threadPoolSize=1
 
     # Android e2e test
-    - node ./scripts/run-ci-e2e-tests.js --android --js --retries 3
+    - source scripts/circle-ci-android-setup.sh && retry3 node ./scripts/run-ci-e2e-tests.js --android --js --retries 2
 
     # testing docs generation is not broken
     - cd website && node ./server/generate.js

scripts/circle-ci-android-setup.sh

@@ -38,4 +38,3 @@ function retry3 {
     }
   done
 }
-

scripts/run-ci-e2e-tests.js

@@ -131,7 +131,7 @@ try {
     });
     SERVER_PID = packagerProcess.pid;
     // wait a bit to allow packager to startup
-    exec('sleep 5s');
+    exec('sleep 15s');
     echo('Executing android e2e test');
     if (tryExecNTimes(
       () => {