Strip Python/Android debug messages from output

[aaaaalbert]

See

• https://seattle.poly.edu/changeset/5649
• https://seattle.poly.edu/changeset/5656

and SeattleTestbed/repy_v2#47.

[aaaaalbert]

safe.py implements stripping already, https://github.com/SeattleTestbed/repy_v2/blob/master/safe.py#L334-L374