Add Apache Tomcat 8.5 port

Apache Tomcat version 8.5 implements the Servlet 3.1, JavaServer Pages 2.3,
Java Unified Expression Language 3.0 and Java WebSocket 1.1 specifications
from the Java Community Process, and includes many additional features that
make it a useful platform for developing and deploying web applications and
web services. Tomcat 8.5 is aligned with Java EE 7.

PR: 215290
Submitted by: vvd@unislabs.com
Approved by: swills (mentor)
Differential Revision: https://reviews.freebsd.org/D10127