kola/test/metadata: add support for new names
kola/test/metadata: add support for new names

coreos-metadata v0.3.0 renamed the variables.

marineam/mantle,glevand/coreos--mantle,quantum/coreos-mantle,dm0-/mantle,glevand/coreos--mantle,quantum/coreos-mantle,mjg59/mantle,dm0-/mantle,mjg59/mantle,marineam/mantle