kubernetes: upgrade to 1.13.5, bump Go to 1.11.9
kubernetes: upgrade to 1.13.5, bump Go to 1.11.9

To pay down technical debt, upgrade to a more recent version of
kubernetes. This is the latest available 1.13.* release at this time.
Bump Go, because 1.11.1 is now the minimum required for kubernetes.

sipb/homeworld,sipb/homeworld,sipb/homeworld,sipb/homeworld