Welcome the new KRB5 1.18 (krb5-118)
In addition, deprecate krb5-116 to retire one year after the release
of krb5-118: Feb 12, 2021.
Major changes in 1.18 (2020-02-12)
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Administrator experience:
* Remove support for single-DES encryption types.
* Change the replay cache format to be more efficient and robust.
Replay cache filenames using the new format end with ".rcache2" by
default.
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