Updated openstack/openstack
Project: openstack/nova  aa480d75c7d9748624312323b5d915a38d4127a6
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Make check more pythonic

Use 'if key in ('metadata', 'system_metadata'):'
instead of 'if key == 'metadata' or key == 'system_metadata''

The reason for the change is:
1. The issue has come up more than once in review cycles
2. It is easier to read

Moving forwards it may be useful if there are extra use cases.

Change-Id: Icd4ab4ebd021720b140f9fdb89d201781388c8ff