Updated openstack/openstack
Project: openstack/swift  37220086d708b22bfe75ff5d693e30e0c67b403f
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improve docs in etc/dispersion.conf-sample

1. add a comment to hint using a new account for using dispersion tools
2. change sample url for keystone from 'saio' to 'localhost'

Change-Id: I4683f5eb0af534b39112f1b7420f67d569c29b3a