remove unused RecConfigFileEntry struct (#8353)
remove unused RecConfigFileEntry struct (#8353)

Follow up to e52009cee1ccccff154b2dc3955697d2adb6bb05
pbchou/trafficserver,duke8253/trafficserver,duke8253/trafficserver,pbchou/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,duke8253/trafficserver,duke8253/trafficserver,duke8253/trafficserver,duke8253/trafficserver