v2.0.0.beta1

• support logic cluster
• add outstanding_requests and watch_count to zookeeper status
• if server not support ipv6, we use 0.0.0.0 instead in listen_host
• get slow_session with condition
• rpm config noreplace
• metadata manage
• fix wrap error issue
• fix ensureHosts issue
• filter stderr from result when ssh run shell script
• use des to encode password while write to clusters.json
• replace json-iterator with sonic to improve performance