Updated log4j to 2.1-SNAPSHOT to fix problem where it throws an exception
during the static initializer of sun.reflect.misc.Trampoline. Fixes bug
NMS-6784.
Merge branch 'jira/NMS-6784' into rc/stable/1.14.0
Merge branch 'rc/stable/1.14.0' of https://github.com/OpenNMS/opennms into rc/stable/1.14.0