Updated openstack/openstack
Project: openstack/glance  a0a43203fde3c89d0f0e3cf03c577186b027db33
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Documentation for Glance tasks

Added some docs for:-
    - configuration
    - notifications
    - statuses

partially implements blueprint async-glance-workers

Change-Id: I4e33bc3be2278d6906968d1dac3aff6587eef6df