[memcached] Add a base_shard_manager Init method which directly takes an instance of connection pool
[memcached] Add a base_shard_manager Init method which directly takes an instance of connection pool

cch123/godropbox,horryq/godropbox,danielrh/godropbox,pattyshack/godropbox,wfxiang08/godropbox,sixolet/godropbox,zj8487/godropbox,abduld/godropbox,danielrh/godropbox,wfxiang08/godropbox,horryq/godropbox,pattyshack/godropbox,cch123/godropbox,gc-locks/gosqlbuilder,abduld/godropbox,cch123/godropbox,dropbox/godropbox,sixolet/godropbox,pattyshack/godropbox,wangtuanjie/godropbox,wangtuanjie/godropbox,dropbox/godropbox,icattlecoder/godropbox,abduld/godropbox,horryq/godropbox,dropbox/godropbox,icattlecoder/godropbox,zj8487/godropbox,icattlecoder/godropbox,danielrh/godropbox,zj8487/godropbox,wangtuanjie/godropbox,wfxiang08/godropbox,sixolet/godropbox