Disallow service names with dots

[devdattakulkarni]

If we define a Service name with numbers in it, then the CRD registration fails with following error:

"status": "Error:The CustomResourceDefinition \"atomic1.0.16s.platformapi.kubeplus\" is invalid: \n* spec.names.plural: Invalid value: \"atomic1.0.16s\": 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])?')\n* spec.names.singular: Invalid value: \"atomic1.0.16\": 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])?')\n* spec.names.kind: Invalid value: \"Atomic1.0.16\": may have mixed case, but should otherwise match: 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])?')\n* spec.names.listKind: Invalid value: \"Atomic1.0.16List\": may have mixed case, but should otherwise match: 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])?')\n

We should disallow service names consisting of dots in them.