PROTON-604: Fixed help message for Perl send example.

Modified the patch slightly to not attempt to perform a connection if
help was displayed.

Contributed by Ernie Allen <eallen@redhat.com>

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1602276 13f79535-47bb-0310-9956-ffa450edef68