[MERGE] Add builtin subunit support.

[Robert Collins]

This adds builtin support for giving test output via subunit. I did have
it as a plugin but its turned out to be a 'requirement' (easiest thing
to use :P) for parallel testing, so I'd like to just make it part of the
core testing facilities we have.

-Rob
-------------- next part --------------
A non-text attachment was scrubbed...
Name: subunit-4166.patch
Type: text/x-patch
Size: 8889 bytes
Desc: not available
Url : https://lists.ubuntu.com/archives/bazaar/attachments/20090320/d434afac/attachment.bin 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 197 bytes
Desc: This is a digitally signed message part
Url : https://lists.ubuntu.com/archives/bazaar/attachments/20090320/d434afac/attachment.pgp