config/v2_0: copy over v1 to v2_0 translate
config/v2_0: copy over v1 to v2_0 translate

Copies in the translator that goes from v1 to v2_0 from
config/translate.go, since this package will now bw responsible for
translating older configs into itself.

ajeddeloh/ignition,coreos/ignition,coreos/ignition,coreos/ignition,ajeddeloh/ignition,ajeddeloh/ignition