api: Put attributes last in ResolvedAddresses.toString()

Attributes is the least likely to be relevant in general, and has the
most random assortment of information. Since xds puts XdsConfig in the
Attributes, moving things before the attributes can make them much
easier to read in logs.

Author: ejona86

api/src/main/java/io/grpc/LoadBalancer.java

@@ -337,8 +337,8 @@ public ResolvedAddresses build() {
     public String toString() {
       return MoreObjects.toStringHelper(this)
           .add("addresses", addresses)
-          .add("attributes", attributes)
           .add("loadBalancingPolicyConfig", loadBalancingPolicyConfig)
+          .add("attributes", attributes)
           .toString();
     }