Since havana, the timezone of windows vm is localtime.
However, there is a time drifting when the windows vm is overloaded.
Disabling hpet option of clock in xml template,
we can sync time without buffering.
From this template,
<clock offset='utc'>
<timer name='pit' tickpolicy='delay'/>
<timer name='rtc' tickpolicy='catchup'/>
</clock>
To this template,
<clock offset='localtime'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
Implements : blueprint add-no-hpet-option-into-guest-clock
Change-Id: I6441b9d2de5897dd1863b53bd7e2578881b53c67
ba3fd16605