Update hashes and set default to 1.16.11 (#6287)

tests/testcases/040_check-network-adv.yml

@@ -14,6 +14,12 @@
     netchecker_port: 31081
 
   tasks:
+    - name: Flannel | Disable tx and rx offloading on VXLAN interfaces (see https://github.com/coreos/flannel/pull/1282)
+      shell: "ethtool --offload flannel.1 rx off tx off"
+      ignore_errors: true
+      when:
+        - kube_network_plugin|default('calico') == 'flannel'
+
     - name: Force binaries directory for Container Linux by CoreOS and Flatcar
       set_fact:
         bin_dir: "/opt/bin"