Fix for Bug NMS-6589

Can't monitor JBoss EAP 6.1.0 or later with the JMXMonitor/JMXCollector
because they don't support jmx-remoting protocol.
Wording tweak in element/rescan.jsp to clarify that it's not just about capabilities.
bump copyright year
Merge remote-tracking branch 'origin/1.12' into feature-rrd-rest