Split GATS task to run on BTRFS and Overlay+XFS
Split GATS task to run on BTRFS and Overlay+XFS

[#139806777]

Signed-off-by: Gareth Clay <8aba8f4b00339badb90ac755871f48a24e433180@pivotal.io>

masters-of-cats/grootfs-release,masters-of-cats/grootfs-release