fix(helm): Ensures tiller pod lands on a linux node

Without a node selector to ensure that tiller deploys on a linux node,
the tiller pod can have issues starting in a mixed cluster.

Fixes #2420

cmd/helm/installer/install.go

@@ -166,6 +166,9 @@ func generateDeployment(opts *Options) *extensions.Deployment {
 							},
 						},
 					},
+					NodeSelector: map[string]string{
+						"beta.kubernetes.io/os": "linux",
+					},
 					SecurityContext: &api.PodSecurityContext{
 						HostNetwork: opts.EnableHostNetwork,
 					},