This reverts commit 71792b9c7c34ff14ca821a421b05b9bd75d6f28b.
Ansible 2.1.2.0's cron module has a bug[0] requiring that a job name be
provided for an absent state when it should be optional. This breaks a
few tasks in the os_keystone role and possibly others.
[0] https://github.com/ansible/ansible-modules-core/issues/5150
Change-Id: Ifdd1dabd38e337842f163ee5d0e7b8cd05d302db