Ported svnTests to latest svn plugin version.

Marked classes and methodes only used by the deprecated test class also as deprecated.

Tidied up docker container and its dependencies.

Changed svn docker user to "svnUser" to prevent possible name overlaps.

 Fixed some typos, messages and jdoc
Tweaked test cases to prevent errors caused by to fast test execution
removed unnecessary assert
added shell step to make the test cases more clear and secure for false positive
Merge branch 'svnTestPort' of https://github.com/itgkarl/acceptance-test-harness