bzr selftest --exclude options should be ORd

[Martin Pool]

$ ./bzr --no-plugins selftest -1 -x breakin -x test_external_diff

seems to allow tests that have either of those terms in their name. To get the desired effect you have to instead say

  bzr --no-plugins selftest -1 -x '(breakin|test_external_diff)'

[Vincent Ladeuil (vila)]

I fall in this trap again :-/

[Vincent Ladeuil (vila)]

More precisely, the issue here is that --exclude is a simple string option so specifying more than once... only takes the later into account.