improve comments, remove unneeded closes...

bitelab/__main__.py

@@ -318,8 +318,8 @@ class TestExecClient(unittest.IsolatedAsyncioTestCase):
 			stdin_task = loop.run_in_executor(None, self.copytask,
 			    io.BytesIO(stdin), stdinwriter)
 
-			# do not close stdout, otherwise we cannot obtain
-			# the value
+			# do not close stdout, otherwise we cannot call
+			# getvalue on BytesIO object
 			stdout_task = loop.run_in_executor(None, self.copytask,
 			    stdoutreader, stdout, False)
 
@@ -335,11 +335,8 @@ class TestExecClient(unittest.IsolatedAsyncioTestCase):
 				except SystemExit as e:
 					ret = e.code
 
-			# No one to read anything anymore
-			stdinwriter.close()
-			stdinreader.close()
-
 			# No one to write anything anymore
+			# close so stdout_task will end
 			stdoutwriter.close()
 
 			# make sure all the data has been copied