Now that the fetchers all preserve the current working
directory, the cwd changes in the try_mirror_url,
download, and checkstatus methods are no longer needed.
(Bitbake rev: 0ed8975c42718342a104a9764a58816f964ec4ea)
Signed-off-by: Matt Madison <matt@madison.systems>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>