pep8: Fix E301 pep8 violations.

Fix "E301: expected (1 or 2) blank line" pep8 violations.

zerver/tornado/ioloop_logging.py

@@ -11,6 +11,7 @@ from django.conf import settings
 try:
     # Tornado 2.4
     orig_poll_impl = ioloop._poll # type: ignore # cross-version type variation is hard for mypy
+
     def instrument_tornado_ioloop():
         # type: () -> None
         ioloop._poll = InstrumentedPoll # type: ignore # cross-version type variation is hard for mypy
@@ -21,6 +22,7 @@ except:
     # will be without actually constructing an IOLoop, so we just assume it will
     # be epoll.
     orig_poll_impl = select.epoll # type: ignore # There is no stub for select.epoll on python 3
+
     class InstrumentedPollIOLoop(PollIOLoop):
         def initialize(self, **kwargs): # type: ignore # TODO investigate likely buggy monkey patching here
             super(InstrumentedPollIOLoop, self).initialize(impl=InstrumentedPoll(), **kwargs)