fix MockAdbProcess wait hangs bug (openatx#1012)

use u2.jar instead of test apk (openatx#1004)

* use u2.jar instead of test apk
* update toast api, use d.last_toast to get toast, d.clear_toast() to reset it
* add more unittests
* fix multi thread when use connect

fix DeadSystemRuntimeException not in message, close openatx#1001

fix takeScreenshot for display_id, change double flash launch to one …

…flash

Add usage for app_auto_grant_permissions

update apk to 2.3.11 to fix dump_hierarchy

Merge branch 'master' of github.com:openatx/uiautomator2

update message

update apk version to 2.3.9 to fix dumpHierarchy sometimes invalid ch…

…ar error

Merge branches 'master' and 'master' of github.com:openatx/uiautomator2