* pika support codis slot mgirate (#48)

* codis slot migrate support

* add slotsreload slotsreloadoff slotsdel slotsscan command

* info command add slots reloading status

* support migrate large keys

* slotsmgrttagone command response fix

* dbsize command get  keys number in time if set slotmigrate mode

* fix some bugs like config get *, slots migrate command only execute on master

* slot migrate support keys with expire time (#49)

* support masterauth and fix slave replication auth (#50)

* support masterauth and fix slave replication auth

* compitible with official auth

1) add lib/ubuntu 2) supply previous commit: 1- optimize tools and libs 2- add distclean for Makefile

fix redis compatibility of kv strlen