Updated openstack/openstack
Project: openstack/nova  a5e728df31f89e4b1fe5bbe541b713cc0a019212
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Update openstack/common/lockutils

The following commits are in this update:

79e6bc6 fix lockutils.lock() to make it thread-safe
ace5120 Add main() to lockutils that creates temp dir for locks
537d8e2 Allow lockutils to get lock_path conf from envvar

Change-Id: I2190d0aae72ef4a29daf8f7d960da82a33b331b4