Fix regression in --rebind-domain-ok in 2.86

The 2.86 domain-match rewrite changed matching from
whole-labels to substring matching, so example.com
would match example.com and www.example.com, as before,
but also goodexample.com, which is a regression. This
restores the original behaviour.

Also restore the behaviour of --rebind-domain-ok=//
to match domains with onlt a single label and no dots.

Thanks to Sung Pae for reporting these bugs and supplying
an initial patch.

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