[bug#35570] java-tomcat: Make it the full package

[Björn Höfling]

The current java-tomcat package is only building the jar-files and uses
Tomcat only as a servlet-api package. This patch series changes it to
the "real" package with a bin, conf, ... directory.

If you have a CATALINA_BASE, i.e. a Tomcat instance directory with
conf, log, webapps, you can start Tomcat like that:

CATALINA_BASE=/home/bjoern/guix/tmp/catalina-home 
/gnu/store/q5dqsiiwb665jfb6ckcfpw3ijgm4gyh7-java-tomcat-8.5.40/bin/startup.sh

And then navigate to http://localhost:8080/ to view your new site.

The standard Tomcat installation copies the commons-daemon.jar and the
java-ecj.jar. We better use symlinks to the input package. But these
would be overridden by a repacking phase: Thus, we need to modify the
ant-build-system, placing this series into the staging branch.

What's finally outstanding is a tomcat-service.

Björn

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