machine-tags: optionally support key/value pairs as machine tags

machine-tags: optionally support key/value pairs as machine tags

Other systems (kubernetes…) allow tagging machines with key/value pairs.
Let's extend our allowed syntax slightly to allow that too. Thankfully,
we enforced a pretty strict ruleset on machine tags, hence we can
introduce this without breaking compatibility.

This basically allows tags to contain "=". If so, then the left-hand
side of it must be unique among machine tags.

When matching against a machine tag, we apply the same rules as before.
This means, that if people want to check if a tag with value applies
they can do:

    ConditionMachineTag=foo=bar

If they just want to check if "foo=" is set to anything, they can use
the usual glob matching:

    ConditionMachineTag=foo=*