Paul Bourke 02fc5ba589 Add documentation on reserving a Glance image
This lets us refer to the fact that some optional headers are in fact
required unless reserving an image.

Fixes bug 1124224

Change-Id: I5646d4dc130efecf991573b363eb1a665012b7df
2013-05-28 13:38:09 +00:00
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