Comment 23 for bug 1459781

Reviewed: https://review.fuel-infra.org/10115
Submitter: Vitaly Sedelnik <email address hidden>
Branch: openstack-ci/fuel-6.0-updates/2014.2

Commit: 271464fa14aba4899e5c9bfb2cc39f28c674af7d
Author: Ivan Kolodyazhny <email address hidden>
Date: Wed Aug 5 15:49:07 2015

Fix block eventlet threads on rbd calls

Commit Ibaf43858d60e1320c339f2523b5c09c7f7c7f91e caused new problem with
cross thread communication. According to Python documentation, code can
lead to a deadlock if the spawned thread directly or indirectly attempts
to import a module. python-rados spawns new thread to connect to
cluster. So I removed new spawning new thread to connect to rados. All
long-running operations calls whith python-rbd are still implemented in
native Python threads to block eventlet loop.

Closes-Bug: #1459781
Change-Id: I4b6c3be71f421067e9aa2657b7b1b3c5d30eb2bb