**Problem:**
Schedule kubedns component to Windows node will cause DNS doesn't work
well

**Solution:**
Add nodeAffinity to kubedns

**Issue:**
https://github.com/rancher/rancher/issues/17423

Signed-off-by: Joshua Benjamin <joshuabnjmn@gmail.com>

**Problem:**
The nginx ingress daemonSet securityContext can not be applied to
version before 0.16.0

**Solution:**
When the nginx controller version is older than 0.16.0, we use the old
way to set it up.

This reverts commit ea4b16b1.

Revert "Add port checks for network plugins"
This reverts commit c73a58d4.

To prevent against accidental SIGSEGV errors we should verify the use
of a non-nil docker client.

For rancher/rancher/issues/17519