documentation.
The image's size is set to zero now during reservation of the image ID if the
image's size is not passed in with headers. In addition,
glance.store.Backend.add() now returns a tuple of (location, size) and
the image's size attribute in the registry is updated to this value if
previously set to zero.
Adds a new test case that ensures the size attribute is set properly
when not included in the image meta headers.
Adds documentation for the new _reserve(), _upload(), and _activate()
methods in glance.server.Controller.
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