after MS restart or one MS crash, in markHostsAsDisconnected, all hosts managed by this MS are marked at Dieconnected, and lastping is set to curent time minus 10 minutes, to make sure reconnect happen within 1 minute
Code changes and schema changes for adding/updating hostTags for hosts and serviceOffering. New local storage allocator 'HostTagBasedLocalStoragePoolAllocator' is added to search for storage pools that have associated hosts having the specified host tag.
1. delete local storage when delete host
2. delete host detail when delete host
3. allow one host in maintance mode in a cluster instead of in a pod
status 6363: resolved fixed