[os] Remove need for is_supported_version in setup
[os] Remove need for is_supported_version in setup

Change the `setup.sh` script so that it first loads `utils.sh`, thus,
removing the need to have the `is_supported_version` function in both
`utils.sh` and `setup.sh`.

mickael83/ubuntu-dotfiles,zlot/dotfiles,mickael83/ubuntu-dotfiles,christophermoura/dotfiles,makabde/dotfiles,pbrooks/dotfiles,makabde/dotfiles,christophermoura/dotfiles,EDiLD/dotfiles,EDiLD/dotfiles,oddlord/dotfiles,newtonne/dotfiles,girishramnani/dotfiles,newtonne/dotfiles,b-boogaard/dotfiles,zlot/dotfiles,AlbertoElias/dotfiles,AlbertoElias/dotfiles,girishramnani/dotfiles