NO-JIRA: Improved run.py error message.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/trunk@1617884 13f79535-47bb-0310-9956-ffa450edef68
NO-JIRA: Handy script find_ports.sh to find all the listening ports used by a system test.

find_ports.sh [ dir ]

Find all the listening ports mentioned in *.log files under dir.
With no dir search under the current directory.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/trunk@1617885 13f79535-47bb-0310-9956-ffa450edef68