Hide default ports from minio image upload urls

[Thor77]

With the current state this behaviour is enabled by default and can be disabled by setting

{
  "minio": {
    "hideDefaultPorts": false
  }
}

or CMD_MINIO_HIDE_DEFAULT_PORTS=false.

Fix #1094

[SISheogorath]

I think we can omit the config setting in favour of just removing the port when it's 443 or 80. I don't expect people to run HTTP on 443 and HTTPS on port 80. If they do, we'll tell them that it's not supported.

[Thor77]

Alright, removed the commits. Will remove the checks for the protocol as well.
Should I document this somewhere/how else then?

[Thor77]

Replaced the protocol + port check with one for port being 80 or 443.

[a60814billy]

Thanks @Thor77