Do not change nova scheduler filters after installed climate

After climate was installed by devstack, it was changing nova default
scheduler filters:
scheduler_available_filters = climatenova.scheduler.filters.climate_filter.ClimateFilter
scheduler_default_filters = ClimateFilter

But the default scheduler filters for nova is the following after
installed by devstack without climate.
scheduler_available_filters = nova.scheduler.filters.all_filters
scheduler_default_filters = RetryFilter, AvailabilityZoneFilter,
RamFilter, ComputeFilter, ComputeCapabilitiesFilter, ImagePropertiesFilter,
ServerGroupAntiAffinityFilter, ServerGroupAffinityFilter

So after installed devstack with climate, nova scheduler filters should
be as following:
scheduler_available_filters = climatenova.scheduler.filters.climate_filter.ClimateFilter
scheduler_available_filters = nova.scheduler.filters.all_filters
scheduler_default_filters = RetryFilter, AvailabilityZoneFilter,
RamFilter, ComputeFilter, ComputeCapabilitiesFilter, ImagePropertiesFilter,
ServerGroupAntiAffinityFilter, ServerGroupAffinityFilter, ClimateFilter

Change-Id: I74272d3282425baeb96a2862b22a26ab0a35a5df
Closes-Bug: #1316417
Merge "Do not change nova scheduler filters after installed climate"