Updated openstack/openstack
Project: openstack/nova  be6fa56b0389addc8e0a79a1c3e4d55ae57b9a87
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Use a dictionary to eliminate the inner loop in _choose_host_filters()

it looks like an o(n²) algorithm, we can use a dictionary to eliminate
the inner loop.

Change-Id: I32747120ae1f2f1bc0a3810a03e0cd9baa7a8d2c