Expand DAL REST API structure and exposed resources

* Cleanup DAL connection REST endpoints, remove primary connection
  endpoint.
* Make connection search endpoint return federation nodes and
  primary connection along user-defined DAL connections
* Expose DAL connection drivers
* Prepare DAL sensitivity level resource

codegen/assets/templates/gocode/store/rdbms/aux_types.go.tpl

@@ -5,6 +5,7 @@ package rdbms
 import (
 	"time"
 	"github.com/cortezaproject/corteza-server/pkg/expr"
+	"github.com/cortezaproject/corteza-server/pkg/geolocation"
 {{- range $path, $alias :=  .imports }}
     {{ $alias }} {{ printf "%q" $path }}
 {{- end }}