[RFC] change test output to subunit when stdout is a pipe

[Robert Collins]

I've noticed that these days I always do the following two things at the
same time, or not at all:
bzr selftest --subunit
bzr selftest > tests.log

by which I mean, I never record test output except in subunit format,
and I never [interactively] use subunit format except when recording
test output.

Would anyone object to a heuristic in bzr selftest to use subunit format
when stdout is a pipe?

-Rob

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