maintenance.upgrade, remove time_init: ntp

[swiftgist]

The time_init setting has been hardcoded into the default global.yml. With the switch to chrony, the entry should be removed and rely on the expectation of the .../ceph/time/default.sls file.

This only impacts existing clusters. The upgrade can remove the "time_init: ntp" line from /srv/salt/ceph/proposals/config/global.yml. For those that wish to keep using ntp, add the same entry to /srv/salt/ceph/stack/global.yml.

For those wishing to switch to chrony before this is implemented, add "time_init: chrony" to /srv/salt/ceph/stack/global.yml.