vm/adb: avoid draining battery

One common issue we see with android devices is that
fuzzing drains battery episodically, device goes down and
then does not boot until one presses the power button.
Check battery level at the beginning of each cycles
and wait if it is too low.
Current numbers are: wait if level < 20% until it is >=30%.
Let's see how it works.

Fixes #79

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