    Fix DRM archival, recovery and generation for non-DES3 keys.

    In the archival, recovery and generation code for symmetric keys,
    we use functions that require knowledge of the symmetric keys algorithm
    and key size.  These were hardcoded to DES3, and so only DES3 worked.

    We added those parameters to the archival request, save them in the
    KeyRecord and retrive them when recovering the key.

    Tests have been added to DRMTest for the relevant usages.

Thanks to jmagne for doing initial investigation and determining what needed to be done.

Please review,

Ade