Drop incomplete Remote Test Container

The Remote Test Container implementation is incomplete and not tested (see [RBCRemoteContainerFactory](https://github.com/ops4j/org.ops4j.pax.exam2/blob/80b7aa20da2cdaeebbb0808272bd6056e53e9f8e/containers/pax-exam-container-remote/src/main/java/org/ops4j/pax/exam/container/remote/RBCRemoteContainerFactory.java)).