Preserve a format of RPC command definitions

Currently RPC commands are formatted in a way that it's easy to read
and that test/lint/check-rpc-mappings.py can parse it.

To void breaking test/lint/check-rpc-mappings.py script by running
clang-format, RPC command definitions should be disabled for clang-format.

src/rpc/misc.cpp

@@ -456,6 +456,7 @@ static UniValue echo(const JSONRPCRequest& request)
     return request.params;
 }
 
+// clang-format off
 static const CRPCCommand commands[] =
 { //  category              name                      actor (function)         argNames
   //  --------------------- ------------------------  -----------------------  ----------
@@ -471,6 +472,7 @@ static const CRPCCommand commands[] =
     { "hidden",             "echo",                   &echo,                   {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
     { "hidden",             "echojson",               &echo,                   {"arg0","arg1","arg2","arg3","arg4","arg5","arg6","arg7","arg8","arg9"}},
 };
+// clang-format on
 
 void RegisterMiscRPCCommands(CRPCTable &t)
 {