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Cloned from launchpad blueprint https://blueprints.launchpad.net/oslo/+spec/parse-iso8601-duration. Description: Add parse_isoduration function in the common timeutils module to convert a string in ISO 8601 duration format to a timedelta object or to seconds. This is currently implemented in Heat to support pause time in the UpdatePolicy for AutoScalingGroup. This can be abstracted to support other use cases where description of a time duration is needed. Specification URL (additional information): http://en.wikipedia.org/wiki/ISO_8601#Durations