Restore print outputs in process (#357)

Fixes #356

Author: blink1073

jupyterlab_server/process.py

@@ -217,7 +217,7 @@ def __init__(self, cmd, startup_regex, logger=None, cwd=None, kill_event=None, e
             line = self._stdout.readline().decode("utf-8")
             if not line:
                 raise RuntimeError("Process ended improperly")
-            self.logger.info(line.rstrip())
+            print(line.rstrip())  # noqa
             if re.match(startup_regex, line):
                 break
 
@@ -257,7 +257,7 @@ def _read_incoming(self):
             if not buf:
                 return
 
-            self.logger.info(buf.decode("utf-8"), end="")
+            print(buf.decode("utf-8"), end="")  # noqa
 
     def _create_process(self, **kwargs):
         """Create the watcher helper process."""