run_guest: Implement going to sleep

Getting back from sleep is left as an exercise to the reverse
engineer...

Signed-off-by: Hector Martin <marcan@marcan.st>

Author: marcan

proxyclient/tools/run_guest.py

@@ -113,3 +113,8 @@ def volumespec(s):
     run_shell(hv.shell_locals, "Entering hypervisor shell. Type ^D to start the guest.")
 
 hv.start()
+
+run_shell(hv.shell_locals, "Hypervisor exited. Entering shell.")
+
+p.smp_stop_secondaries(True)
+p.sleep(True)