Revert "NMS-2691 - JRobin --font handling"

Needs tests, broke in the real world:

2013-12-13 12:14:19,170 WARN  [qtp1917395522-1458] JRobinRrdStrategy: unable to create font from font argument TITLE:18
java.lang.ArrayIndexOutOfBoundsException: 2
        at org.opennms.netmgt.rrd.jrobin.JRobinRrdStrategy.processRrdFontArgument(JRobinRrdStrategy.java:771)
        at org.opennms.netmgt.rrd.jrobin.JRobinRrdStrategy.createGraphDef(JRobinRrdStrategy.java:565)
        at org.opennms.netmgt.rrd.jrobin.JRobinRrdStrategy.createGraphReturnDetails(JRobinRrdStrategy.java:375)
        at org.opennms.netmgt.rrd.jrobin.JRobinRrdStrategy.createGraph(JRobinRrdStrategy.java:357)
        at org.opennms.netmgt.rrd.QueuingRrdStrategy.createGraph(QueuingRrdStrategy.java:1070)

This reverts commit 62bdf46fa03ad7f6c8500f22e0d882e0badd9bc5.