CLOUDSTACK-7595: Remove unnecessary multiply factor for job expiry

Backported using a6ee4112a54043033233334c900d9bcd1cebf157 by
Koushik Das <koushik@apache.org>

CLOUDSTACK-7595: Config parameters "job.expire.minutes" and
"job.cancel.threshold.minutes" incorrectly getting multiplied by a factor of 60
Removed the unnecessary multiply factor for both the config parameters. Also
removed the duplicate entries from Config.java as these are not required

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>