Add chkconfig comment to launch script

Update the embedded launch script to include a `chkconfig` comment. This
solves the "Service doesn't support chkconfig" error when executing
the chkconfig command.

Fixes gh-3115

spring-boot-tools/spring-boot-loader-tools/src/main/resources/org/springframework/boot/loader/tools/launch.script

@@ -17,6 +17,7 @@
 # Default-Stop:      0 1 6
 # Short-Description: Spring Boot Application
 # Description:       Spring Boot Application
+# chkconfig:         345 99 01
 ### END INIT INFO
 
 [[ -n "$DEBUG" ]] && set -x