implement zfs info cache mechanism
add ssh tunnel implementation
zfs: rename pool_name to _zfs_pool_name
create STAGINGS and SNAPSHOTS while creation of pool instead of XXX_cmd_init
cleanup stack: append item with '+=()' instead of '[last-index]=' syntax
pbadmin-cmd-init: remove -x flag. ident to increase readibility
add server side push support
add client side push support