Comment 1 for bug 1908040

md5 in this particular location is not being used for any security-sensitive purpose, and was marked as such in this change:

https://opendev.org/openstack/cinder/commit/bb25e9550b4ab3241c5d05434cb790ad9dcebcec

We could change to a different algorithm for validating etags but there doesn't appear to be a pressing security motivation for doing so.

This change above allows this usage of md5 to work on a FIPS-configured system.