tests/test-hg-parseurl.py.out

scmutil: update cached copy when filecached attribute is assigned (issue3263)

When assigning a new object to filecached properties, the cached object that
was kept in the _filecache map was still holding the old object.

By implementing __set__, we track these changes too and update the cached
copy as well.

http://example.com/no/anchor, branches: (None, [])
http://example.com/an/anchor, branches: ('foo', [])
http://example.com/no/anchor/branches, branches: (None, ['foo'])
http://example.com/an/anchor/branches, branches: ('bar', ['foo'])
http://example.com/an/anchor/branches-None, branches: ('foo', [])
http://example.com/, branches: (None, [])
http://example.com/, branches: (None, [])
http://example.com/, branches: ('foo', [])