consul: Sort datacenter list. Fixes #198

consul/catalog_endpoint.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/armon/go-metrics"
 	"github.com/hashicorp/consul/consul/structs"
+	"sort"
 	"time"
 )
 
@@ -84,6 +85,9 @@ func (c *Catalog) ListDatacenters(args *struct{}, reply *[]string) error {
 		dcs = append(dcs, dc)
 	}
 
+	// Sort the DCs
+	sort.Strings(dcs)
+
 	// Return
 	*reply = dcs
 	return nil