Increase timeout for adb wait-for-device to 20 minutes

Author: ekigamba

.travis.yml

@@ -41,7 +41,7 @@ before_script:
   - echo no | android create avd --force -n test -t $ANDROID_TARGET --abi $ANDROID_ABI
   - ls -la
   - emulator64-x86 -avd test -no-skin -no-audio -no-window &
-  - adb wait-for-device
+  - timeout 1200 adb wait-for-device
   - adb shell input keyevent 82 &
 
 script: