Remove Task class

This is not use in the nodepool codebase anymore. The tasks submitted to
the TaskManager all exist inside of shade/sdk now.

Change-Id: Ie914be9f8687f4634996fb880e5c383dab7de6f0

nodepool/task_manager.py

@@ -16,12 +16,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys
 import threading
 import logging
 import queue
 import time
-import requests.exceptions
 
 from nodepool import stats
 
@@ -30,38 +28,6 @@ class ManagerStoppedException(Exception):
     pass
 
 
-class Task(object):
-    def __init__(self, **kw):
-        self._wait_event = threading.Event()
-        self._exception = None
-        self._traceback = None
-        self._result = None
-        self.args = kw
-
-    def done(self, result):
-        self._result = result
-        self._wait_event.set()
-
-    def exception(self, e, tb):
-        self._exception = e
-        self._traceback = tb
-        self._wait_event.set()
-
-    def wait(self):
-        self._wait_event.wait()
-        if self._exception:
-            raise self._exception.with_traceback(self._traceback)
-        return self._result
-
-    def run(self, client):
-        try:
-            self.done(self.main(client))
-        except requests.exceptions.ProxyError as e:
-            raise e
-        except Exception as e:
-            self.exception(e, sys.exc_info()[2])
-
-
 class TaskManager(object):
     log = logging.getLogger("nodepool.TaskManager")