WIP: tests/emulator/test_channels_shell: investigate what happens to … #206

Job	Run time
prepare-avd (29)	20s
prepare-n-o-d	1m 39s
prepare-droidctl	42s
emulate (29, android_integration)	8m 31s
emulate (29, bootstrap_flakes)	7m 55s
emulate (29, bootstrap_channels)	9m 15s
emulate (29, poke_around)	7m 39s
emulate (29, test_channels_uiautomator)	8m 31s
emulate (29, test_channels_shell)	9m 19s
	53m 51s

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