nixos/testing: fix invalid node names detection

the use of python further restricts possible RFC1035 host labels since
dash is not allowed for use in python identifiers.

The previous implementation of this check was flawed, since it did not
check the `hostName` value that is actually used to construe the
identifier, but the node name, which can be anything, e.g. just `machine`.

The previous implementation, by further restricting RFC1035 labels, only
for the sake of testing seems to be an unacceptable restriction and should
be addressed separately.

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