The command can be used to validate an input --config and throw
warnings and errors.
Add a new argument strctErrors to the functions
documentMapTo{Init|Join}Configuration(). This allows
to return errors from the calls to VerifyUnmarshalStrict().
Add a new function verifyKnownGVKs() in config/common.go
that is used to verify if a list of GVKs in a config file is
known. This function is used by the "validate" and "migrate"
commands.
Both commands now throw errors for unknown APIs or fields.
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