Okay, seems there is an issue with install.pl and the RPMs for 1.1.1. After installing OpenNMS, edit /opt/OpenNMS/bin/install.pl and change line 121 to read:

$TOMCAT = 1 if ($arg eq "t");

Then run:
$OPENNMS_HOME/bin/install.pl -q $OPENNMS_HOME/etc/create.sql

Sorry about that.