Use LOGNOTICE instead of LOGERROR when bailing early due to
non-multipart message.
Test clamd->ping() before scanning, and bail if it doesn't
answer (with an appropriate error).
Patch submitted by Dave Rolsky <autarch@urth.org>.
git-svn-id: https://svn.perl.org/qpsmtpd/branches/0.3x@583 958fd67b-6ff1-0310-b445-bb7760255be9