Get rid of duplicated Reva config struct

Consolidate all services to use the Reva config struct for the shared package.
This works because all services (except 'notifications', 'thumbnails' and
'webdav') where using the same config keys and environment variables for
setting the reva gateway.

services/webdav/pkg/config/config.go

@@ -18,9 +18,8 @@ type Config struct {
 
 	HTTP HTTP `yaml:"http"`
 
-	OcisPublicURL   string `yaml:"ocis_public_url" env:"OCIS_URL;OCIS_PUBLIC_URL" desc:"URL, where oCIS is reachable for users."`
-	WebdavNamespace string `yaml:"webdav_namespace" env:"WEBDAV_WEBDAV_NAMESPACE" desc:"CS3 path layout to use when forwarding /webdav requests"`
-	RevaGateway     string `yaml:"reva_gateway" env:"REVA_GATEWAY" desc:"The CS3 gateway endpoint."`
-
-	Context context.Context `yaml:"-"`
+	OcisPublicURL   string          `yaml:"ocis_public_url" env:"OCIS_URL;OCIS_PUBLIC_URL" desc:"URL, where oCIS is reachable for users."`
+	WebdavNamespace string          `yaml:"webdav_namespace" env:"WEBDAV_WEBDAV_NAMESPACE" desc:"CS3 path layout to use when forwarding /webdav requests"`
+	Reva            shared.Reva     `yaml:"reva"`
+	Context         context.Context `yaml:"-"`
 }

services/webdav/pkg/config/defaults/defaultconfig.go

@@ -3,6 +3,7 @@ package defaults
 import (
 	"strings"
 
+	"github.com/owncloud/ocis/v2/ocis-pkg/shared"
 	"github.com/owncloud/ocis/v2/services/webdav/pkg/config"
 )
 
@@ -37,7 +38,9 @@ func DefaultConfig() *config.Config {
 		},
 		OcisPublicURL:   "https://127.0.0.1:9200",
 		WebdavNamespace: "/users/{{.Id.OpaqueId}}",
-		RevaGateway:     "127.0.0.1:9142",
+		Reva: shared.Reva{
+			Address: "127.0.0.1:9142",
+		},
 	}
 }
 

services/webdav/pkg/service/v0/service.go

@@ -60,7 +60,7 @@ func NewService(opts ...Option) (Service, error) {
 	// chi.RegisterMethod("REPORT")
 	m.Use(options.Middleware...)
 
-	gwc, err := pool.GetGatewayServiceClient(conf.RevaGateway)
+	gwc, err := pool.GetGatewayServiceClient(conf.Reva.Address)
 	if err != nil {
 		return nil, err
 	}