Support "touch" command for memcached and allow negative exptime #344
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The PR is similar to Netflix/dynomite#76
The touch command is not supported in twemproxy. I'm not sure if there's any deliberate purpose, if so, please tell me.
Touch with negative exptime is supported by memcached while not well documented. I'm not familiar with its inner implements but I guess the proxy should better transport without any interruption.