Ensure private attributes are encrypted on the wire. HTCONDOR-730
Ensure private attributes are encrypted on the wire. HTCONDOR-730

Fix a bug that accidentally disabled the encryption of the private
attributes of a ClassAd sent via CEDAR over an otherwise-unencrypted
conneciton.
While fixing the bug, ensure we minimize the number of times we check
whether each attribute in the ClassAd is private.

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