Upgrade go to v1.13.6

Disable db tests on publish

Cleanup go.sum

Update k8s to v1.17.1

Enable mysql & postgres tests

Upgrade containerd to v1.3.3-k3s1

Check versions for dot in metadata

Upgrade kine to v0.3.3

Update dqlite to 1.3.1-r1

Run kubelet with containerd flag

Warn if NPC can't start rather than fatal error

Update manifest publish

Should resolve rancher/k3s#1283

Test cleanup

The containerd flag was accidentally added to kubelet and is
deprecated, but needed for cadvisor to properly connect with
the k3s containerd socket, so adding for now.

If the ip_set kernel module is not available we should warn
that the network policy controller can not start rather than
cause a fatal error.

Also adds module probing and config checks for ip_set.

Flannel hostgw support

Update air-gap for traefik 1.7.19

Upload build to google cloud bucket