Deprecated use of :func:`asyncio.get_event_loop` without running event loop.
Emit deprecation warning for :mod:`asyncio` functions which implicitly
create a :class:`~asyncio.Future` or :class:`~asyncio.Task` objects if there
is no running event loop and no explicit *loop* argument is passed:
:func:`~asyncio.ensure_future`, :func:`~asyncio.wrap_future`,
:func:`~asyncio.gather`, :func:`~asyncio.shield`,
:func:`~asyncio.as_completed` and constructors of :class:`~asyncio.Future`,
:class:`~asyncio.Task`, :class:`~asyncio.StreamReader`,
:class:`~asyncio.StreamReaderProtocol`.
