Convert ordinary breakpoints to vtable ops

This converts "ordinary" breakpoint to use vtable_breakpoint_ops.
Recall that an ordinary breakpoint is both the kind normally created
by users, and also a base class used by other classes.

gdb/python/py-finishbreakpoint.c

@@ -305,7 +305,7 @@ bpfinishpy_init (PyObject *self, PyObject *args, PyObject *kwargs)
 			 bp_breakpoint,
 			 0,
 			 AUTO_BOOLEAN_TRUE,
-			 &bkpt_breakpoint_ops,
+			 &vtable_breakpoint_ops,
 			 0, 1, internal_bp, 0);
     }
   catch (const gdb_exception &except)