enable distributed filter matching

This pr enables distributed filter matching for pg2sphinx_trigger.py
https://github.com/geoadmin/service-sphinxsearch/pull/173

distributed indices can be updated/listed with:

```bash
$ python /home/ltclm/service-sphinxsearch/deploy/pg2sphinx_trigger.py  -i swisssearch -c list
17 indexes are using the index pattern: swisssearch
      address -> kogis
      address_metaphone -> kogis
      address_soundex -> kogis
      district -> stopo
      district_metaphone -> stopo
      district_soundex -> stopo
      gg25 -> stopo
      gg25_metaphone -> stopo
      gg25_soundex -> stopo
      kantone -> stopo
      kantone_metaphone -> stopo
      kantone_soundex -> stopo
      parcel -> dritte
      sn25 -> stopo
      sn25_metaphone -> stopo
      sn25_soundex -> stopo
      zipcode -> stopo

# Or with the deploy-int-conf deploy-prod-conf commands:
$ make deploy-int-config index=swisssearch
$ make deploy-prod-config index=swisssearch
```