[MERGE] Make it possible to blackboxtest rules

[Marius Kruger]

Hi,

I was trying to write a blackbox test for a command in a plugin which
requires custom rules for the test,
and figured out that its not so easy to do that at the moment.
this patch does the following:
  * extract rules.reset_rules() which instantiates our default user-based
rule object
    which can be called from tests to reload it.
  * tree.iter_search_rules now uses the default parameter differently
    to ensure that if we change our rules._per_user_searcher
    after tree.py loaded, that the new one will get used.

with it, its possible to write rule-dependant blackbox tests similar to some
of the blackbox
tests relying on configs. eg.

def test_something(self):
        config.ensure_config_dir_exists()
        open(rules.rules_filename(),'wb').write("""
[name *.py]
foo=bar
""")
        rules.reset_rules()
        # run test that depends on the rule
        out,err = self.run_bzr('my-command')


-- 
<| regards
U| Marius
H| <><
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