Add a closelog() wrapper to clear the environment

Our openlog() wrapper fills in a couple of variables, and those were
kept around even after a closelog(), and thus, affected ul_format()
calls even after a closelog().

This in turn, made one of the test cases fail, as that was relying on
the default behaviour, which was modified due to an openlog() in an
earlier test case.

We now wrap closelog() aswell, and NULL out our settings to get a
clean state, and add a test case to verify this behaviour aswell.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

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