Apache proxypass to access services on sister project mf-chsdi3

- Defining a new variable SERVICE_URL pointing on the service project
- User rc files sourcing rc_dev to avoiding redefining all variables

*print* (mapfish print server)
http://mf-geoadmin30t.bgdi.admin.ch/ltmom/print/info.json?url=http://mf-geoadmin30t.bgdi.admin.ch/ltmom/print

*ogc proxy* (papyrus_ogcproxy)
http://mf-geoadmin30t.bgdi.admin.ch/ltmom/ogcproxy?url=http://api.geo.admin.ch/main/wsgi/doc/data/bln-style.kml