remove --machines from code and docs

docs/getting-started-guides/coreos/cloud-configs/standalone.yaml

@@ -90,7 +90,7 @@ coreos:
         --logtostderr=true
         Restart=always
         RestartSec=10
-    - name: kube-controller-manager.service 
+    - name: kube-controller-manager.service
       command: start
       content: |
         [Unit]
@@ -103,7 +103,6 @@ coreos:
         ExecStartPre=/usr/bin/wget -N -P /opt/bin https://storage.googleapis.com/kubernetes-release/release/v0.18.2/bin/linux/amd64/kube-controller-manager
         ExecStartPre=/usr/bin/chmod +x /opt/bin/kube-controller-manager
         ExecStart=/opt/bin/kube-controller-manager \
-        --machines=127.0.0.1 \
         --master=127.0.0.1:8080 \
         --logtostderr=true
         Restart=always