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This adds a new opcode parameter ‘name_check’ (similar to ip_check) that
is not required to be present (to easy backwards compatibility for
tools).

It also adds a CheckArguments to LUCreateInstance and changes the
workflow related to instance IP checks and NIC initialisation based on
it.
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>