Return only stdout and stderr channels in read_all

Adapt docstring to new behavior and remove ref to channel id being part
of the return value.

Author: jraby

kubernetes/client/ws_client.py

@@ -135,10 +135,10 @@ def readline_stderr(self, timeout=None):
         return self.readline_channel(STDERR_CHANNEL, timeout=timeout)
 
     def read_all(self):
-        """Read all of the inputs with the same order they recieved. The channel
-        information would be part of the string. This is useful for
-        non-interactive call where a set of command passed to the API call and
-        their result is needed after the call is concluded.
+        """Return buffered data received on stdout and stderr channels.
+        This is useful for non-interactive call where a set of command passed
+        to the API call and their result is needed after the call is concluded.
+        Should be called after run_forever() or update()
 
         TODO: Maybe we can process this and return a more meaningful map with
         channels mapped for each input.
@@ -178,9 +178,10 @@ def update(self, timeout=0):
                     channel = ord(data[0])
                     data = data[1:]
                     if data:
-                        # keeping all messages in the order they received for
-                        # non-blocking call.
-                        self._all += data
+                        if channel in [STDOUT_CHANNEL, STDERR_CHANNEL]:
+                            # keeping all messages in the order they received for
+                            # non-blocking call.
+                            self._all += data
                         if channel not in self._channels:
                             self._channels[channel] = data
                         else: