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`ch-image push`: spurious layer hash changes with older pigz

pigz versions older than 2.4 store timestamp metadata in the gzip header when using --no-name. This causes ch-image to produce different layer hashes for the same image in storage.

notes:

  1. if both pigz and gzip are on the system, ch-image will use pigz.
  2. the pigz version available on centos 7 is 2.3.4
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