Wait before polling QMP for host poweroff

This patch waits before polling qemu with QMP so that it has time to be ready
for requests. It also increases wait time in case the host machine is slow.

src/ogRest.py

@@ -98,15 +98,15 @@ class ogThread():
 		ogRest.state = ThreadState.IDLE
 
 	def check_vm_state_loop(ogRest):
-		POLLING_WAIT_TIME = 3
+		POLLING_WAIT_TIME = 12
 		while True:
+			time.sleep(POLLING_WAIT_TIME)
 			state = ogRest.operations.check_vm_state()
 			installed_os = ogRest.operations.get_installed_os()
 			if state == OgVM.State.STOPPED and \
 			   ogRest.state == ThreadState.IDLE and \
 			   len(installed_os) > 0:
 				ogRest.operations.poweroff_host()
-			time.sleep(POLLING_WAIT_TIME)
 
 	def poweroff(ogRest):
 		time.sleep(2)