Fixes for Python 3.8

Created originally on Bitbucket by Anonymous

Was already merged in Bitbucket before import, marked as merged by the import user

from Fedora python-passlib RPM patches:

• Remove time.clock(), deprecated in 3.8

  The function time.clock(), used in passlib/utils/init.py has been removed. It was deprecated since Python 3.3. More info: https://docs.python.org/3.8/whatsnew/3.8.html#api-and-feature-removals

  To make the code both Python 2 and 3 compatible, use timeit.default_timer

• Fix testsuite on Linux

  crypt support may be present in libxcrypt

  Author: Björn Esser besser82@fedoraproject.org Date: Wed Mar 13 10:02:43 2019 +0100

  https://src.fedoraproject.org/rpms/python-passlib/c/29e9641462291e812d7eb50d402e1b3a74c7a95e

• Fix for Python 3.8

  This was a deprecation when running in Python 3.7:

  DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working if isinstance(source, collections.Sequence):