[feedback] format mac does not work in swagger:strfmt

Problem statement

I ran into an issue that I wish swagger could help me to validate MAC address in struct defined in swagger.yml, like:

      MacAddress:
        description: "MAC address of the container."
        type: "string"
        format: mac

Then the generated struct has a validation function to validate the mac format of this field.

However it fails.

Could we support this feature in go-swagger?

swagger version: version: 0.12.0
go version: go version go1.9.1 darwin/amd64
OS: