Quote strings in bash populated YAML files.

Quoting is hard.  When writing strings into YAML files, wrap them in single quotes.  Also escape any embedded single quotes in those strings via a double signle quote ('').

cluster/vagrant/provision-minion.sh

@@ -40,22 +40,24 @@ done
 
 # Let the minion know who its master is
 mkdir -p /etc/salt/minion.d
-echo "master: $MASTER_NAME" > /etc/salt/minion.d/master.conf
+cat <<EOF >/etc/salt/minion.d/master.conf
+master: '$(echo "$MASTER_NAME" | sed -e "s/'/''/g")'
+EOF
 
 # Our minions will have a pool role to distinguish them from the master.
 cat <<EOF >/etc/salt/minion.d/grains.conf
 grains:
   network_mode: openvswitch
-  node_ip: $MINION_IP
-  etcd_servers: $MASTER_IP
-  api_servers: $MASTER_IP
+  node_ip: '$(echo "$MINION_IP" | sed -e "s/'/''/g")'
+  etcd_servers: '$(echo "$MASTER_IP" | sed -e "s/'/''/g")'
+  api_servers: '$(echo "$MASTER_IP" | sed -e "s/'/''/g")'
   networkInterfaceName: eth1
-  apiservers: $MASTER_IP
+  apiservers: '$(echo "$MASTER_IP" | sed -e "s/'/''/g")'
   roles:
     - kubernetes-pool
     - kubernetes-pool-vagrant
-  cbr-cidr: $MINION_IP_RANGE
-  minion_ip: $MINION_IP
+  cbr-cidr: '$(echo "$MINION_IP_RANGE" | sed -e "s/'/''/g")'
+  minion_ip: '$(echo "$MINION_IP" | sed -e "s/'/''/g")'
 EOF
 
 # we will run provision to update code each time we test, so we do not want to do salt install each time