Use echo over printf.
    
    This should (on the fourth try) fix the fedmsg quoting/escaping issue.
    
    Tested in staging:  https://apps.stg.fedoraproject.org/datagrepper/id?id=2015-377b0bcb-364c-4636-aa69-3b316a155921&size=extra-large
    
    Signed-off-by: Ralph Bean <rbean@redhat.com>