`utils.py`: Make `magic_timestamp` a public variable

Shashwat Dalalrequested to merge
shashwatdalal/make-magic-timestamp-public into master

Description

Some plugin elements, such as docker-element and tar-element, require to set created and/or modified meta-data fields. It would be nice to use magic_timestamp to ensure these fields are being set in a consistent and deterministic way

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