Endpoint fails to create if namespace starts with a number

[ctron]

Describe the bug

If the namespace a MessagingEndpoint is located in, starts with a number, the creation of the service will fail, as a service name must be a valid DNS name, and must not start with a number.

To Reproduce
Steps to reproduce the behavior:

1. Create MessagingInfrastructure
2. Create a new namespace 123
3. Create a MessagingProject
4. Create a MessagingEndpoint
5. Service does not get created

Expected behavior

I should be possible to create endpoints in a valid Kubernetes namespace.

Screenshots

Status section of MessagingEndpoint

{
  "conditions": [
    {
      "lastTransitionTime": "2020-07-08T16:04:52Z",
      "status": "True",
      "type": "FoundProject"
    },
    {
      "lastTransitionTime": "2020-07-08T16:04:52Z",
      "status": "Unknown",
      "type": "ConfiguredTLS"
    },
    {
      "lastTransitionTime": "2020-07-08T16:04:52Z",
      "status": "True",
      "type": "AllocatedPorts"
    },
    {
      "lastTransitionTime": "2020-07-08T16:04:52Z",
      "status": "Unknown",
      "type": "Created"
    },
    {
      "lastTransitionTime": "2020-07-08T16:04:52Z",
      "message": "Service \"8e0a8244-68b3-41bc-b9ff-919d14ef8431-downstream\" is invalid: metadata.name: Invalid value: \"8e0a8244-68b3-41bc-b9ff-919d14ef8431-downstream\": a DNS-1035 label must consist of lower case alphanumeric characters or '-', start with an alphabetic character, and end with an alphanumeric character (e.g. 'my-name',  or 'abc-123', regex used for validation is '[a-z]([-a-z0-9]*[a-z0-9])?')",
      "status": "False",
      "type": "ServiceCreated"
    },
    {
      "lastTransitionTime": "2020-07-08T16:04:52Z",
      "status": "Unknown",
      "type": "Ready"
    }
  ],
  "internalPorts": [
    {
      "name": "8e0a8244-68b3-41bc-b9ff-919d14ef8431-downstream-AMQP",
      "port": 40018,
      "protocol": "AMQP"
    }
  ],
  "message": "Service \"8e0a8244-68b3-41bc-b9ff-919d14ef8431-downstream\" is invalid: metadata.name: Invalid value: \"8e0a8244-68b3-41bc-b9ff-919d14ef8431-downstream\": a DNS-1035 label must consist of lower case alphanumeric characters or '-', start with an alphabetic character, and end with an alphanumeric character (e.g. 'my-name',  or 'abc-123', regex used for validation is '[a-z]([-a-z0-9]*[a-z0-9])?')",
  "phase": "Configuring",
  "type": "NodePort"
}

Additional context
Add any other context about the problem here.