Add optional support for the CCC (Clear Command Channel) command.

This command is dangerous, since it allows commands to be transmitted
without integrity checking, so the default behavior without the -c
option is still for the server to refuse to accept unprotected
commands.

    * ftpd.c: Add a new command line option, -c, which tells the
    server to accept the CCC command.

    * ftpcmd.y: If the -c option was given, check to make sure the CCC
    command itself was integrity protected, and then set ccc_ok to
    allow future commands to be transmitted as cleartext.
    (getline): Now that CCC is potentially allowed, we must check to
    see if we are parsing an unprotected command even if a security
    context is established (i.e. auth_type is set).

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@10846 dc483132-0cff-0310-8789-dd5450dbe970

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