OpenCL: use 'opencl kernels' instead of 'opencl codelet' to avoid confusion with starpu codelet object

src/drivers/opencl/driver_opencl.c

@@ -313,7 +313,7 @@ void _starpu_opencl_init(void)
                         }
                 }
 
-                // Get location of OpenCl codelet source files
+                // Get location of OpenCl kernel source files
                 _starpu_opencl_program_dir = getenv("STARPU_OPENCL_PROGRAM_DIR");
 
                 // initialise internal structures

src/drivers/opencl/driver_opencl_utils.c

@@ -112,7 +112,7 @@ char *_starpu_opencl_load_program_source(const char *filename)
         source[x] = '\0';
 
 
-        _STARPU_DEBUG("OpenCL codelet <%s>\n", source);
+        _STARPU_DEBUG("OpenCL kernel <%s>\n", source);
 
         fclose(fh);