Updated openstack/openstack
Project: openstack/python-keystoneclient  8b0c5eea3c76db63d3646d5d8ccc23461539d07e
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Using common method 'bool_from_string' from oslo strutils

Using common method 'bool_from_string' from oslo strutils to replace
utils.string_to_bool.

partially implements blueprint common-client-library-2

Change-Id: I22ee9c5a4b48e85606e033ab87d4adb72b665ee6