ceph-infra: remove ntp_rmp.yml and ntp_debian.yml

ceph-infra: remove ntp_rmp.yml and ntp_debian.yml

This commit fixes the merge conflict that occurred during the
auto-backport and auto-merge of the commit
488281187e8ac6c587db74961db9e075f31c8eae.

Also please note that the commit
488281187e8ac6c587db74961db9e075f31c8eae was merged (on PR 3477)
"as it is" (despite of merge conflicts) which was not supposed to be
the case ideally. This had a side-effect that the feature of supporting
multiple NTP daemons (new ones are namely chronyd and timesyncd) was
also backported which is itself against the convention. For
consistency's sake the feature was backported to stable-3.1 as well.

Signed-off-by: Rishabh Dave <ridave@redhat.com>