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/server.cpp

@@ -255,6 +255,7 @@ static UniValue uptime(const JSONRPCRequest& jsonRequest)
     return GetTime() - GetStartupTime();
 }
 
+// clang-format off
 /**
  * Call Table
  */
@@ -266,6 +267,7 @@ static const CRPCCommand vRPCCommands[] =
     { "control",            "stop",                   &stop,                   {}  },
     { "control",            "uptime",                 &uptime,                 {}  },
 };
+// clang-format on
 
 CRPCTable::CRPCTable()
 {