config/v2_0: copy in translation unit test from config
config/v2_0: copy in translation unit test from config

Copy in the unit test for the v1 to v2_0 translator from
config/translate_test.go.

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