Allow a 'random' value to be set in scheduled tasks time definition

Note that testing anything with random values is tricky - theoretically you could get the same values 100x in a row, so remember to repeat if it looks like you are not getting something random. Edit enrol/imsenterprise/db/tasks.php and change the hour and minute fields to R Edit enrol/imsenterprise/version.php and increment the version Observe the scheduled tasks screen for the Enrolment file processing task and note the minute and hour Edit enrol/imsenterprise/version.php and increment the version Observe the scheduled tasks screen for the Enrolment file processing task and note the minute and hour - it should have changed Repeat this a few times and VERIFY the minute and hour are changign to random values Edit the task and tick the 'reset to defaults' button and VERIFY the time changes to random values Change your moodle prefix to do a new install - verify that the time for IMS enrollment has changed to a random value. Run unit tests