Fix NMS-6949 snmp-request utility broken from Log4J 2 changeover

Pulled in Log4j2-over-SLF4J and SLF4J-API JARs.
Merge branch 'jira/NMS-6949' into rc/stable/1.14.0
Fix for Bug NMS-6226

Collectd is still collecting data from each duplicate IPs after removing
the duplicates.

Now it is OK to have duplicates, Collectd won't be confused anymore, but
the data will be collected twice from the duplicate IP.
Merge branch 'rc/stable/1.14.0' of github.com:OpenNMS/opennms into 1.14.0
Merge remote-tracking branch 'origin/rc/stable/1.14.0' into jira/NMS-6931