Tim Abbott 2eebacf2dc push_notifications: Lazily import APNS libraries. ...

The APNS client libraries (especially the hyper.http20 one) were
determined via profiling to take significant time during the import
process, so we move them to be lazily imported in order to optimize
the overall Zulip import process.  This save up to about 100ms in
import time.

These libraries are only used in certain Django processes inside
zulipchat.com, and so are unnecessary both in development as well as
for self-hosted Zulip servers.

2018-10-17 11:59:33 -07:00

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