tools: ratbagctl.devel: fix commit() async call

If we leave ratbagctl.devel too soon, ratbagd gets killed before it even
receives the async call for commmit(), meaning everything we do on the
device is lost.

0.5 is empirical. It seems on my system 0.2 is enough (0.1 doesn't seem
to work). Hopefully this value is not device dependent.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

tools/ratbagctl.devel.in

@@ -26,6 +26,7 @@
 # DEALINGS IN THE SOFTWARE.
 
 import os
+import time
 import toolbox
 import signal
 import sys
@@ -62,6 +63,9 @@ def main(argv):
                 return
             else:
                 f(ratbagd, cmd)
+                # give time for ratbagd to receive async requests before
+                # we try to terminate it
+                time.sleep(0.5)
     finally:
         try:
             if cmd.keepalive: