fs: delete the tapdisk object once it has been shutdown
fs: delete the tapdisk object once it has been shutdown

djs55/message-switch,xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch,djs55/message-switch-1,djs55/message-switch,djs55/message-switch-1,djs55/message-switch,djs55/message-switch-1