[MERGE][0.12] Skip copyright and license tests for plugins

[Martin Pool]

On 18 Oct 2006, John Arbash Meinel <john at arbash-meinel.com> wrote:
> Etienne Goyer noticed that when you install site-wide plugins along with
> bzr, the new copyright checks recurse into the bzrlib/plugins/*
> directory, and tests start failing.
> 
> The attached patch adds '/plugins/' to the list of excluded directories.
> Certainly there was never any intent that 3rd party tools would have the
> same copyright or exact license.

+1

-- 
Martin