[MERGE] Sniff KnownFailure etc harder when reading subunit results.

[John Arbash Meinel]

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Robert Collins wrote:
> This makes bzr selftest --parallel=ec2 handle KnownFailure etc.
> 
> -Rob
> 

Wouldn't it have been better written as:

lines = str(exc).rstrip('\n').split('\n')
if lines:
  if lines[-1].startswith(prefix):
...

Anyway, as long as it works, I guess.

John
=:->
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