This change is an improvement of the commit
5012136868 and provides a cleaner
implementation. Previously flows were applied on
OVSBridge.defer_apply_off which could be called by an other
greenthread: it was impossible to ensure that all flows are applied
in a unique OVSBridge.defer_apply_off call. This change ensures that
all flows defined using a DeferredOVSBridge are applied on
DeferredOVSBridge.apply_flows or DeferredOVSBridge.__exit__ if not
exception is raised.
Author: Cedric Brandily <zzelle@gmail.com>
Co-Authored-By: Edouard Thuleau <edouard.thuleau@cloudwatt.com>
Related-bug: #1263866
Change-Id: I1f260629ef95b98ee80e2ff946c3606da8fe7608
cf2c2ff4ab