Update Tomcat Zip, Tar, Docker tasks to exclude unneeded webapps/directories

[bjagg]

Is your feature request related to a problem? Please describe.
For a clean, lean Tomcat deployment from these binaries, deployers have to manually remove logs, temp files, and unneeded webapps.

Describe the solution you'd like
Update Gradle tasks that wrap up Tomcat to ignore logs/,work/, temp/, portal/, webapps/docs, webapps/examples, webapps/host-manager, and webapps/manager.

[ChristianMurphy]

Part of the logic from, https://github.com/Jasig/uPortal-start/blob/262c4096cca4abfb6c8847a880fbae4d88542b6b/gradle/tasks/tomcat.gradle#L166-L183 could be reused.

[bjagg]

For Dockerfile, COPY does not have exclusions. The recommendation is to run rm ...

COPY . /some/where/
RUN rm -Rf /some/where/e

[bjagg]

tomcatZip and tomcatTar already have exclusions, just need to add a few more

https://github.com/Jasig/uPortal-start/blob/262c4096cca4abfb6c8847a880fbae4d88542b6b/gradle/tasks/tomcat.gradle#L198