docs(install_faq): document tiller panic for auth failure
docs(install_faq): document tiller panic for auth failure

This documents an issue reported in Slack that turned out to be related
to security configuration in Kubernetes.

sushilkm/helm,kdada/helm,rbwsam/helm,helm/helm,jascott1/helm,fibonacci1729/helm,michelleN/deployment-manager,adamreese/deployment-manager,thomastaylor312/helm,bacongobbler/helm,technosophos/deployment-manager,iamzhout/helm,FengyunPan/helm,fibonacci1729/helm,technosophos/deployment-manager,jascott1/helm,kdada/helm,flynnduism/helm,qwangrepos/helm,eicnix/helm,adamreese/helm,iamzhout/helm,SlickNik/helm,thomastaylor312/helm,bacongobbler/helm,flynnduism/helm,michelleN/deployment-manager,eicnix/helm,adamreese/helm,bradj/helm,rbwsam/helm,helm/helm,adamreese/deployment-manager,technosophos/deployment-manager,yan234280533/helm,technosophos/deployment-manager,adamreese/deployment-manager,technosophos/k8s-helm,adamreese/deployment-manager,michelleN/deployment-manager,yan234280533/helm,technosophos/deployment-manager,technosophos/k8s-helm,bradj/helm,appscode/helm,adamreese/deployment-manager,FengyunPan/helm,michelleN/deployment-manager,sushilkm/helm,appscode/helm,qwangrepos/helm,SlickNik/helm