Refactor: Remove underscore from _X11Control and _SamsungTCPControl
Refactor: Remove underscore from _X11Control and _SamsungTCPControl

The class name shows up in the error message from the base class's
NotImplementedError. Also for consistency with the other remote-control
implementations.

stb-tester/stb-tester,stb-tester/stb-tester,stb-tester/stb-tester,stb-tester/stb-tester