Remove CoreFilter and RamFilter from enabled_filters in >= Ocata

[Edward Hope-Morley]

The introduction of the placement api in the Ocata charms release, means that these filters are no longer needed (along with DiskFilter) since the providers/hypervisors that they would previously have been eliminated by these filters will have already been eliminated by the placement api query that is now performed prior to filtering. Therefore these filters are now redundant.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/640802
Committed: https://git.openstack.org/cgit/openstack/charm-nova-cloud-controller/commit/?id=b99d806cf3dccab76161883a6d521231971070c0
Submitter: Zuul
Branch: master

commit b99d806cf3dccab76161883a6d521231971070c0
Author: James Page <email address hidden>
Date: Mon Mar 4 16:20:12 2019 +0000

    Update default scheduler filters

    Make the default set of scheduler filters conditional on the release
    being deployed; For Pike or later the CoreFilter, RamFilter and
    DiskFilter are superfluous to requirements as this filters are in
    effect completed by the Placement API.

    Add DiskFilter to list of filters for older OpenStack releases.

    Change-Id: Iddb4f1f068b982dcd9a70b11b89df1be9f8aaf20
    Closes-Bug: 1731302
    Closes-Bug: 1732164

[James Page (james-page)]

https://review.openstack.org/#/c/640802/