[Bug 50661] New: LibvirtTool: Automatically create Windows snapshots with test signing turned on

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50661

Bug ID: 50661
           Summary: LibvirtTool: Automatically create Windows snapshots
                    with test signing turned on
           Product: Wine-Testbot
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Having test configurations with test signing turned on would be useful:
https://www.winehq.org/pipermail/wine-devel/2020-October/175882.html

There is now one such Windows 10 configuration, w1064_tsign, which was created
manually.

But to generalize this LibvirtTool should know how to turn on test signing
before creating live snapshots. Fortunately this seems pretty simple: just run
"bcdedit /set testsigning on" and reboot. So it should be possible to add that
in Revert().