[crypto] Encode unicode strings in _cypherer() pycrypto accept both bytes or string but pycryptodome, which will be introduced in next changeset, doesn't accept this. For backward compatibility, encode unicode strings in _cypherer()

#!/bin/sh -e

if [ "$1" = "purge" ] ; then
        rm -rf /etc/cubicweb.d/
        rm -rf /var/log/cubicweb/
        rm -rf /var/lib/cubicweb/
fi

#DEBHELPER#
 
exit 0