* Update to v1.26.9
Signed-off-by: Johnatas <johnatasr@hotmail.com>

* Bump containerd and stargz versions
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

* Print message on upgrade fail
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

* Send Bad Gateway instead of Service Unavailable when tunnel dial fails

Works around new handling for Service Unavailable by apiserver aggregation added in kubernetes/kubernetes#119870
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

* Add 60 seconds to server upgrade wait to account for delays in apiserver readiness

Also change cleanup helper to ensure upgrade test doesn't pollute the
images for the rest of the tests.
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

---------
Signed-off-by: Johnatas <johnatasr@hotmail.com>
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
Co-authored-by: Brad Davidson <brad.davidson@rancher.com>