feat: add route for sw update client python tool

[janfeemers]

if the update server is behind a reverse proxy a route is needed. The route should be optional and also work with web-sever without an additional route.

Usage:

python ./main.py ./swu.swu 192.168.0.100 80 /update

[github-actions]

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[embetrix]

@janfeemers
I don't get the point of this MR ?

does this already not work ?

python ./main.py ./swu.swu 192.168.0.100/path/to/update 80

[janfeemers]

@embetrix because this does not work.

you have the url_upload variable:

url_upload = "http://{}:{}/upload"
self.url_status.format(self._host_name, self._port)
# results in: http://{self._host_name}:{self._port}/upload -> http://example.com/update:80/upload

What we would need is:

--http://example.com/update:80/upload
++http://example.com:80/update/upload