reset upload failed if download was ok

local changes are overwritten now anyway.

Signed-off-by: Achim Königs <garfonso@mobo.info>
do not retry upload if upload will never succeed

some error codes implicate upload will always fail
(like 403 errors). In this case don't retry upload
on every sync.
In this cases now the etag is reset and a re-download
is triggered, so the local version will be matched to
the remote on.

Signed-off-by: Achim Königs <garfonso@mobo.info>
fixed issue with proxy usage.

Signed-off-by: Achim Königs <garfonso@mobo.info>
removed some parameter.

Signed-off-by: Achim Königs <garfonso@mobo.info>
changelog

Signed-off-by: Achim Königs <garfonso@mobo.info>
removed unused parameter

Signed-off-by: Achim Königs <garfonso@mobo.info>