VpsAdmin#install: fix node saving
VPS#features: use vzctl --netfilter instead of obsoleted --iptables
Version 1.21.2
Update changelog
New storage system inception, task scheduler

Storage supports snapshotting and transfers. Snapshot/dataset
confirmations are not finished.

Scheduler uses cron which invokes a script that communicates
with vpsAdmind over a socket.
Storage: branching for transfer, transaction confirmations
Add shaper

Shaper rules created at init, add/remove/update operations.
Transactions for adding/removing shapers
Shaper: add global mutex, only one thread may manipulate it at a time
Firewall: use global mutex when registering IPs
Transaction for root shaper changing
Firewall/shaper init, flush and reinit via remote control
Remote control: add remote console using remote-pry
Shaper: support IPv6
Changelog for v1.22.0
Gemfile: fix pry-remote
Merge branch 'master' of git.int.vpsfree.cz:vpsadmind into devel
Command#save: support transaction chains, confirmation edit