lnrpc+rpcserver: rename ScriptPubkey to PkScript on Utxo msg

lnrpc/rpc.proto

@@ -686,8 +686,8 @@ message Utxo {
     /// The value of the unspent coin in satoshis
     int64 amount_sat = 3 [json_name = "amount_sat"];
 
-    /// The scriptpubkey in hex
-    string script_pubkey = 4 [json_name = "script_pubkey"];
+    /// The pkscript in hex
+    string pk_script = 4 [json_name = "pk_script"];
 
     /// The outpoint in format txid:n
     OutPoint outpoint = 5 [json_name = "outpoint"];

lnrpc/rpc.swagger.json

@@ -3068,9 +3068,9 @@
           "format": "int64",
           "title": "/ The value of the unspent coin in satoshis"
         },
-        "script_pubkey": {
+        "pk_script": {
           "type": "string",
-          "title": "/ The scriptpubkey in hex"
+          "title": "/ The pkscript in hex"
         },
         "outpoint": {
           "$ref": "#/definitions/lnrpcOutPoint",