PROTON-458: Perl Messenger now dies on error conditions.

Added the qpid::proton::check_for_errors() method that takes the return
code of a method and dies if the value is an error.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1547155 13f79535-47bb-0310-9956-ffa450edef68