Key flag handling, more trailing whitespace cleanup.

At this point we are passing most of the unit tests in RPC loopback
mode.  Remaining failure is TestKeys.test_keygen_token_vs_session(),
which gets HAL_ERROR_KEY_NAME_IN_USE when attempting to generate a
session key and a token key with the same CKA_ID value, so clearly
something is not quite right yet in the keystore selection logic.

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