Changes

* <code>vzctl set --save</code>: do not save parameters if failed to apply ({{B|2032}})

* <code>vzctl restore</code>: fix non-working in-CT quota after restore for ploop case

* Fix giving excessive permissions for ugid quota disk device

* <code>vzctl console</code>: do not issue SAK on detach (it can kill scripts)

* <code>vzmigrate</code>: skip vzquota ops for ploop-based CTs (related to {{B|2252}})

* <code>vzmigrate</code>: do not migrate ploop CT if ploop is not available on dst

* Fix error handling in <code>vps_is_run()</code> ({{B|2243}})