ipc_service: Adding functions to allow for the teardown of an IPC instance

[jacksonc-xlnx]

This builds upon my previous patch which allowed you to teardown an endpoint. This patch allows the whole ipc_service instance to be closed. It is intended to be used to tidy up in the case that an endpoint goes down or there is another failure in the ipc_service.

[carlescufi]

@carlocaione @hubertmis could you take a look please?

[jacksonc-xlnx]

@carlocaione Can this now be merged?

[carlocaione]

@carlocaione Can this now be merged?

We are in code freeze now. This must wait for the release to be out before merging.