Improved utility to dump and restore memcached data

Utility dumps all known key-value pairs from memcached. Connection
parameters are provided vi config file. Also utility has the following
params:
  --file FILE, -f FILE  File name where to store data
  --restore, -r         Restore data into memcached
  --min-compress-len MIN_COMPRESS_LEN, -m MIN_COMPRESS_LEN
                        The threshold length to kick in auto-compression

Change-Id: Ied6bd2b95cccba42be5a69e13812b2206a0c73b9
Merge "Improved utility to dump and restore memcached data"