QPID-4533: Modified perftests to support writing results to a database, and enhanced visualisation-jfc to allow it to read these results.
Previously only CSV output/input was supported by these modules respectively.
Also modified files in perftests/etc/ to allow convenient running of perftests.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1440312 13f79535-47bb-0310-9956-ffa450edef68