In the memory resident mode, the user may not see a message about the server
starting, it would be in the cookerdeamon logfile. We don't need this to
test the server is functioning correctly so just drop the test.
Add in an extra check that the file we expected to be created was
created when exporting PR values.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>