bitbake: knotty: Make the bb.command.CommandExit event terminate bitbake

This matches the other bb.command.Command* events and without it,
running `bitbake --revisions-changed` will hang indefinitely if there
are changed revisions.

(Bitbake rev: 40520d229c8ea51ee9784184ab5d13a82dd1eb61)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/knotty.py

@@ -590,6 +590,7 @@ def main(server, eventHandler, params, tf = TerminalFilter):
             if isinstance(event, bb.command.CommandExit):
                 if not return_value:
                     return_value = event.exitcode
+                main.shutdown = 2
                 continue
             if isinstance(event, (bb.command.CommandCompleted, bb.cooker.CookerExit)):
                 main.shutdown = 2