Fix Android Emulator Hangs (#2298)
Fix Android Emulator Hangs (#2298)

In some conditions the emulator process will hang without the device
coming online because of the output buffering. Once we have the serial
number we no longer need the output.

This also removes some unused code for stderr and an unused logfile.
google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz