Search dav spaces (#4661)

* Add a Ref option to SearchRequest, e.g. for limiting the search to a space

* Enable REPORT requests for /dav/spaces URLs

* Limit the search to the according space in case of /dav/spaces searches

* Add changelog

* Adapt expected failures

* Comment exported functions

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

@@ -41,6 +41,7 @@ func DefaultConfig() *config.Config {
 	}
 }
 
+// EnsureDefaults adds default values to the configuration if they are not set yet
 func EnsureDefaults(cfg *config.Config) {
 	// provide with defaults for shared logging, since we need a valid destination address for "envdecode".
 	if cfg.Log == nil && cfg.Commons != nil && cfg.Commons.Log != nil {
@@ -78,6 +79,7 @@ func EnsureDefaults(cfg *config.Config) {
 	}
 }
 
+// Sanitize sanitizes the configuration
 func Sanitize(cfg *config.Config) {
 	// no http endpoint to be sanitized
 }