XD-1991 Use tomcat from platform

- Explicit use of tomcat version to handle logging introduces
the issue on memory leak from `WebappClassLoader` reported in
XD-1991.
 - Use tomcat from platform (assuming little bit of tomcat logging from
apache.catalina/apache.coyote is fine)
- Remove `WebappClassLoader`'s logging settings from config

Add jul-to-slf4j runtime dependency
  - This will enable SLF4JBridgeHandler to reroute tomcat logging
to SLF4J