Avoid key stripping and key cutting to avoid collision between keys provided by user.
Nicolas Delaby authored
 *Let Memcached Plugin deal with SERVER_MAX_KEY_LEN
 *escape key with hexadecimal encoder which output allowed chars (binascii.b2a_hex)



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28982 20353a03-c40f-0410-a6d1-a30d3c3de9de
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