Fixed the open message, it would previously create an invalid JSON object

Previously:
```Text
"capabilities": { "1": "Multiprotocol(ipv4 unicast,ipv4 multicast,ipv4 nlri-mpls,ipv4 mpls-vpn,ipv4 flow,ipv4 flow-vpn,ipv6 unicast,ipv6 mpls-vpn,ipv6 flow,ipv6 flow-vpn,l2vpn vpls)", "65": ASN4(65000)  }   }  } }
```

Now:
```Text
"capabilities": { "1": "Multiprotocol(ipv4 unicast,ipv4 multicast,ipv4 nlri-mpls,ipv4 mpls-vpn,ipv4 flow,ipv4 flow-vpn,ipv6 unicast,ipv6 mpls-vpn,ipv6 flow,ipv6 flow-vpn,l2vpn vpls)", "65": "ASN4(65000)"  }   }  } }
```