Updated openstack/openstack
Project: openstack/cinder  2b4eee56e1a246daf381b07af91191574efa6e15

Don't use _execute directly in brick/iscsi

The brick/iscsi module has a run helper that
should be used for executing commands.  There
are a number of inconsistencies where _execute
is called directly.

This patch moves everythign to use the run method
to keep things consistent and also to fix up some
potential issues with variables becoming corrupt
under heavy load.

Change-Id: Idfc183f2ed1ad73b64fc893efcc07972c95926c6