looprpc: add is_external_addr to loopout req

looprpc/client.proto

@@ -235,6 +235,13 @@ message LoopOutRequest {
     The address type of the account specified in the account field.
      */
     AddressType account_addr_type = 16;
+
+    /*
+    A flag indicating whether the defined destination address does not belong to
+    the wallet. This is used to flag whether this loop out swap could have its
+    associated sweep batched.
+    */
+    bool is_external_addr = 17;
 }
 
 /*

looprpc/client.swagger.json

@@ -1110,6 +1110,10 @@
         "account_addr_type": {
           "$ref": "#/definitions/looprpcAddressType",
           "description": "The address type of the account specified in the account field."
+        },
+        "is_external_addr": {
+          "type": "boolean",
+          "description": "A flag indicating whether the defined destination address does not belong to\nthe wallet. This is used to flag whether this loop out swap could have its\nassociated sweep batched."
         }
       }
     },