rio uninstall does not cleanup all the rio resources

[rancher-max]

Describe the bug
Running rio uninstall leaves some rio resources in the cluster.

To Reproduce

1. Run rio uninstall in a cluster that has rio installed.
   It removes everything from kubectl api-resources and kubectl get crds -A as expected, but there are three unexpected items with kubectl get clusterroles -A:

...
rio-rio-system-autoscaler                                              2d14h
rio-rio-system-cert-manager                                            2d14h
rio-rio-system-webhook                                                 2d14h
...

Running kubectl get validatingwebhookconfigurations.admissionregistration.k8s.io -A yields No resources found as expected.

Kubernetes version & type (GKE, on-prem): kubectl version -- multiple versions, but most recently:

Client Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.0", GitCommit:"2bd9643cee5b3b3a5ecbd3af49d09018f0773c77", GitTreeState:"clean", BuildDate:"2019-09-19T13:57:45Z", GoVersion:"go1.12.9", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"16", GitVersion:"v1.16.2", GitCommit:"c97fe5036ef3df2967d086711e6c0c405941e14b", GitTreeState:"clean", BuildDate:"2019-10-15T19:09:08Z", GoVersion:"go1.12.10", Compiler:"gc", Platform:"linux/amd64"}

Rio version: rio info
Uninstalled, but this was on v0.6.0-alpha.1

[rancher-max]

Also, kubectl get clusterrolebindings leaves these resoures as well:

...
rio-rio-system-cert-manager-rio-rio-system-cert-manager   4d
rio-rio-system-autoscaler-rio-rio-system-autoscaler       4d
rio-rio-system-webhook-rio-rio-system-webhook             4d
...

[rancher-max]

Also does not remove any secrets that were added with rio (githubtoken in my case)