Kludgey fix for new macOS version numbers. HTCONDOR-626
Kludgey fix for new macOS version numbers. HTCONDOR-626

Since a lot of the OS version numbering code ignores the first number in
macOS versions, treat 11.X as 10.16.X and 12.X as 10.17.X.
This is most noticeable in the OpSys* attributes in the machine ad.

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