Bump flannel to 0.5.5 in instructions

docs/getting-started-guides/docker-multinode/master.md

@@ -115,7 +115,7 @@ or it may be something else.
 Now run flanneld itself:
 
 ```sh
-sudo docker -H unix:///var/run/docker-bootstrap.sock run -d --net=host --privileged -v /dev/net:/dev/net quay.io/coreos/flannel:0.5.3
+sudo docker -H unix:///var/run/docker-bootstrap.sock run -d --net=host --privileged -v /dev/net:/dev/net quay.io/coreos/flannel:0.5.5 --ip-masq
 ```
 
 The previous command should have printed a really long hash, copy this hash.

docs/getting-started-guides/docker-multinode/master.sh

@@ -139,8 +139,9 @@ start_k8s(){
     --net=host \
     --privileged \
     -v /dev/net:/dev/net \
-    quay.io/coreos/flannel:0.5.3 \
+    quay.io/coreos/flannel:0.5.5 \
     /opt/bin/flanneld \
+    --ip-masq \
     -iface="eth0")
 
     sleep 8

docs/getting-started-guides/docker-multinode/worker.md

@@ -91,7 +91,7 @@ or it may be something else.
 Now run flanneld itself, this call is slightly different from the above, since we point it at the etcd instance on the master.
 
 ```sh
-sudo docker -H unix:///var/run/docker-bootstrap.sock run -d --net=host --privileged -v /dev/net:/dev/net quay.io/coreos/flannel:0.5.3 /opt/bin/flanneld --etcd-endpoints=http://${MASTER_IP}:4001
+sudo docker -H unix:///var/run/docker-bootstrap.sock run -d --net=host --privileged -v /dev/net:/dev/net quay.io/coreos/flannel:0.5.5 /opt/bin/flanneld --ip-masq --etcd-endpoints=http://${MASTER_IP}:4001
 ```
 
 The previous command should have printed a really long hash, copy this hash.

docs/getting-started-guides/docker-multinode/worker.sh

@@ -125,8 +125,9 @@ start_k8s() {
         --net=host \
         --privileged \
         -v /dev/net:/dev/net \
-        quay.io/coreos/flannel:0.5.3 \
+        quay.io/coreos/flannel:0.5.5 \
         /opt/bin/flanneld \
+        --ip-masq \
         --etcd-endpoints=http://${MASTER_IP}:4001 -iface="eth0")
 
     sleep 8