Description of problem:
Snapshots always sorted by Name. Sort by Creation Time seems more useful.

Product version:
2.2.1

How reproducible:
Create a bunch of snapshots for VM.

Steps to Reproduce:
1. Create snapshot named "Zealot"
2. Create snapshot named "Awesome"
3. Create snapshot named "Greedy"

Actual results:
In list of snapshots we have:
Awesome
Greedy
Zealot

Expected results:
Zealot
Awesome
Greedy

Additional info:
It's necessary to prepend snapshot names with numeric prefix to keep it in chronological order. That is not always convenient, especially when we need to remove some snapshots time-to-time.