Shawn Willden a3762c873a Document user authentication restrictions on public keys.
A Keystore bug causes user authentication to be required to use public
keys from key pairs that are authentication-bound.  Because it's too
late to fix Keystore we're instead documenting the behavior.

Bug: 23792178
Change-Id: Iee3a78d6cbf25949e890b1c50841580ce748da2e
2015-09-11 11:22:59 -06:00
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