QPID-4281: Fix setting of log4j configuration in system tests. While testing the fix, some tests were found to be failing on spawned profile due to config problems - also fixed these.
Applied patch from Philip Harvey <phil@philharveyonline.com> and myself.

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1438053 13f79535-47bb-0310-9956-ffa450edef68