add hashtag and keys
points:

- add checkkcfg
- migrate slave work when slave down.
upgrade nutcracker instance, support --filter
check_proxy_config on monitory every minute
check_proxy_config on monitory every minute
add check_kv
update Changelog
REDIS_MGR_CHECK_PREFIX = 'redis-mgr-check-'
update Changelog
put check_proxy_config in a thread