modhtp: Don't destroy libhtp's tx, let it auto cleanup
Rule engine: Use the request started flag for the "Rule execution object not created" test
Updates to installation and RPM packaging.

* An empty ironbee.conf is now installed as /etc/ironbee/ironbee.conf.
* The ironbee-trafficserver RPM adds the ironbee plugin configuration to
  trafficserver's plugin.config file when installing.
docs: Document libinjection based transformation and operator.
docs: Document SQL transformation.
docs: Alphabetize operators.