Fix dnssec-signzone and -verify logging (again)
While fixing #2359 (closed), 'report()' was changed so that it would print the newline.
Newlines were missing from the output of 'dnssec-signzone' and 'dnssec-verify' because change 664b8f04 moved the printing from newlines to the library.
This had to be reverted because this also would print redundant newlines in logfiles.
While doing the revert, some newlines in 'lib/dns/zoneverify.c' were left in place, now making 'dnssec-signzone' and 'dnssec-verify' print too many newlines.
This commit removes those newlines, so that the output looks nice again.
(cherry picked from commit 18c62a07)
Closes #2359 (closed)