Remove DiskFilter and RamFilter from Nova scheduling defaults
Remove DiskFilter and RamFilter from Nova scheduling defaults

In Ocata, we replaced the verification logic for CPU, RAM and disk by calling
the Placement API instead of using those legacy scheduler filters, it's time
to remove them from the default list of filters that are run, especially
since Nova now removes them from the conf opt defaults thanks to
Ibe1cee1cb2642f61a8d6bf9c3f6bbee4f2c2f414

Change-Id: I2e81f1bbce7476d63e84e70dcdd59a1163f89f09
Related-Bug: #1709328

openstack-dev/devstack,openstack-dev/devstack,nawawi/openstack,noironetworks/devstack,dtroyer/devstack,nawawi/openstack,noironetworks/devstack,group-policy/devstack,dtroyer/devstack,group-policy/devstack