Add wifi tethering automated tests.

Add wifi ap mode support in sl4a.
Add tethering test case in WifiManagerTest.
Add support for user specified android devices.
Add wait for event function to event_dispatcher.
Fix minor typos and imports in various acts library files.
Fix a bug in fetch_and_flash utility to support aosp builds.

Change-Id: I19a5de9446ba18bcfd475c1c21c52118550c8972
1 file changed