Remove usage of nova's RamFilter

As of https://review.openstack.org/596502/ in Stein
the RamFilter in nova is deprecated. It is not needed
when using the filter_scheduler driver (which is the
default scheduler driver).

Change-Id: Iee3dab7b5dc7074e9840826afe58ce2bfa40a3df

ansible/roles/nova/templates/nova.conf.j2

@@ -59,7 +59,7 @@ transport_url = {{ rpc_transport_url }}
 [filter_scheduler]
 available_filters = nova.scheduler.filters.all_filters
 available_filters = blazarnova.scheduler.filters.blazar_filter.BlazarFilter
-enabled_filters = RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter,BlazarFilter
+enabled_filters = RetryFilter,AvailabilityZoneFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter,BlazarFilter
 {% endif %}
 
 [api]