support FIPS builds without SHA-1 #5460
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hashlib.sha1may not be available in some FIPS builds that go beyond what FIPS requires into what it recommends. Apparently some RedHat containers do this. We don't want to change the default, but now it is accessed lazily so that it fails at runtime rather than at import time. This way, the developer has time after importing to change the default before using.fixes #5448