cooker: Ensure we handle inotify before running the next command

The inotify watch events are handled "at idle" which could in theory mean
a command could run before any preceeding inotify events have been processed.
This leads to a theoretical race window where those events may have a
signficicant effect on the command.

Add a mechanism to allow us to ensure all pending events are processed before
running commands.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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