Fix dnssec-signzone and -verify logging (again)

Fix dnssec-signzone and -verify logging (again)

While fixing #2359, 'report()' was changed so that it would print the
newline.

Newlines were missing from the output of 'dnssec-signzone'
and 'dnssec-verify' because change
664b8f04f5f2322086138f5eda5899a62bcc019b 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.