cleanup nsupdate system test

some extraneous output

I:nsupdate:check that named accepts '_dns' SVCB with missing ALPN (check-svcb no) (75)
_dns.ns.relaxed.	0	IN	SVCB	1 ns.relaxed. key7="/{?dns}"
I:nsupdate:check that named rejects '_dns' SVCB with missing DOHPATH (76)
I:nsupdate:check that named accepts '_dns' SVCB with missing DOHPATH (check-svcb no) (77)
_dns.ns.relaxed.	0	IN	SVCB	1 ns.relaxed. alpn="h2"

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