Met a issue when I tried to set the distribution type.

[Han Yan]

When I tried to set distibuition type like below:
select memc_servers_behavior_set("MEMCACHED_BEHAVIOR_DISTRIBUTION","MEMCACHED_DISTRIBUTION_KETAMA");
 It will return
INALID VALUE FOR DISTRIBUTION! see: memc_list_distribution_types();
even though the value was copied from the result of memc_list_distribution_types().
I have take a look at server.c and got below from line 245：
strcasecmp(args->args[1], "MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA") )
So I tried to use MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA as the value to set the distribution type, and successed. But when I run memc_servers_behavior_get("MEMCACHED_BEHAVIOR_DISTRIBUTION"), it will return a mysql connection lost issue.
ERROR 2013 (HY000): Lost connection to MySQL server during query