Updated openstack/openstack
Project: openstack/glance  153e33a8f5ae097aa1d9f0bdbf0010fc387dc22c
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Sync units module from olso

There are lots of numeric expressions across some projects, such as
1024*1024 , 1024**3, 1000, 1000000 etc. This patch adds binary and
decimal unit constants. Replacing nummeric experssions with these
constants makes code more readable.

Change-Id: I45fb5a10009f22b1eedb07b3e52f1ce40403b068