change server address from string to a type

weed/pb/master.proto

@@ -62,6 +62,7 @@ message Heartbeat {
     bool has_no_ec_shards = 19;
 
     map<string, uint32> max_volume_counts = 4;
+    uint32 grpc_port = 20;
 
 }
 
@@ -127,7 +128,7 @@ message SuperBlockExtra {
 
 message KeepConnectedRequest {
     string name = 1;
-    uint32 grpc_port = 2;
+    string client_address = 3;
 }
 
 message VolumeLocation {
@@ -137,6 +138,7 @@ message VolumeLocation {
     repeated uint32 deleted_vids = 4;
     string leader = 5; // optional when leader is not itself
     string data_center = 6; // optional when DataCenter is in use
+    uint32 grpc_port = 7;
 }
 
 message LookupVolumeRequest {
@@ -156,6 +158,7 @@ message LookupVolumeResponse {
 message Location {
     string url = 1;
     string public_url = 2;
+    uint32 grpc_port = 3;
 }
 
 message AssignRequest {
@@ -172,16 +175,11 @@ message AssignRequest {
 }
 message AssignResponse {
     string fid = 1;
-    string url = 2;
-    string public_url = 3;
     uint64 count = 4;
     string error = 5;
     string auth = 6;
-    message Replica {
-        string url = 1;
-        string public_url = 2;
-    }
-    repeated Replica replicas = 7;
+    repeated Location replicas = 7;
+    Location location = 8;
 }
 
 message StatisticsRequest {
@@ -232,6 +230,7 @@ message DiskInfo {
 message DataNodeInfo {
     string id = 1;
     map<string, DiskInfo> diskInfos = 2;
+    uint32 grpc_port = 3;
 }
 message RackInfo {
     string id = 1;