[MERGE] Speed up blackbox.test_cat by 2 seconds

[Alexander Belchenko]

Alexander Belchenko has voted -1.
Status is now: Vetoed
Comment:
I'm sorry, but avoiding subprocess is wrong thing.
'bzr cat' should be tested in subprocess on win32, otherwise
it's hard to test mangling of line-endings on windows.

Either make it conditional depending on platform,
or make other call for bzr commands without invoking subprocess.

But in current form: -1 from me.


For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20070718080617.GK27285%40steerpike.home.puzzling.org%3E