webadmin: Snapshots info panel resizable and tooltips

VMs -> Snapshots sub-tab: info panel columns are now support
resizing and tool-tips.

Change-Id: Ie306afa9ca0326515c39810571524a742e8d9040
Bug-Url: https://bugzilla.redhat.com/956378
Signed-off-by: Daniel Erez <derez@redhat.com>