TMF: Close sequence diagram view after sequence diagram tests

TMF: Close sequence diagram view after sequence diagram tests

This will make sure that the sequence diagram view is not open in
other tests while running all JUnit tests.

This should fix failures when running all JUnit tests in a loop.

Change-Id: I13109a0edff4d08f228d0dc218b8a5564accc067
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/52983
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>