Revert "New class and test to support Mylyn Jenkins connector tests"

fixes #545

This reverts commit 8b4daa4cb80d3c2287856436c7ebe1c2595396d3.
REDDEER-346: Close all shells after each test
REDDEER-346: Call closeAllShells from IAfterTest
Applied API changes
Fail if there is an open shell
Fixed JavaDoc
Reviewed org.jboss.reddeer.direct plugin javadoc (fixes #463)