Tim Burke d1e1f8d8d6 Stop lazy importing keystoneclient
There were two basic problems:

  - We'd try to import on every attempt at getting auth, even when we
    already know keystoneclient isn't available.
  - Sometimes devs would hit some crazy import race involving (some
    combination of?) greenthreads and OS threads.

So let's just try the imports *once*, at import time, and have None
sentinels if it fails. Try both versions separately to decouple
failures; this should let us support a wider range of keystoneclient
versions.

Change-Id: I2367310aac74f1b7c5ea0cb1a822a491e4ba8e68
2018-09-07 16:56:13 -07:00
..
2016-10-24 01:52:37 +02:00
2018-09-07 16:56:13 -07:00
2018-07-24 23:12:51 +00:00
2015-12-30 11:01:33 -08:00