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xapi_guest_agent: Update xenstore keys for Windows PV drivers versions (#6432)

Windows PV drivers do not store their version information into
`drivers/{xeneventchn,xenvbd,xennet}` xenstore keys since 2015, see:

* PV drivers commit `<a class=hub.com/xapi-project/xen-api/commit/784af16810d705ba2bc02bab6ac93b24119f886c">784af1681 (Publish
distribution information to xenstore)`
https://xenbits.xen.org/gitweb/?p=pvdrivers/win/xenbus.git;a=commit;h=784af16810d705ba2bc02bab6ac93b24119f886c

* Xen commit `<a class=hub.com/xapi-project/xen-api/commit/71e64e163b2dae7d08f7d77ee942749663f484d5">71e64e163 (docs: Introduce
xenstore paths for PV driver information)`
https://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=71e64e163b2dae7d08f7d77ee942749663f484d5

Instead it is stored like this:
```
drivers/0 = "XenServer XENBUS 9.1.9.105 "
drivers/1 = "XenServer XENVBD 9.1.8.79 "
drivers/2 = "XenServer XENVIF 9.1.12.101 "
drivers/3 = "XenServer XENIFACE 9.1.10.87 "
drivers/4 = "XenServer XENNET 9.1.7.65 "
```

Modify `xapi_guest_agent` to list such entries under `drivers/` and
present version information for each driver.

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