Make vdisk/pdisk popup to be accessible for slower mouse movers

When mouse comes over vdisk or pdisk popup is displayed
It has links, users often move their mouse from vdisk/pdisk element to the respective popup.

According to feedback some users don't make it due to the blazing speed of popup disappearing.

https://nda.ya.ru/t/400S1UGu7JMHeX

Let's make UI more accessible.