NO-JIRA: Updated gitignore to not ignore files name config.sh

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1527607 13f79535-47bb-0310-9956-ffa450edef68
QPID-5189: Created config.sh for Qpid Dispatch

The file sets or updates the PYTHONPATH to include the path to the
Python modules for Qpid Dispatch.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1527608 13f79535-47bb-0310-9956-ffa450edef68