<feature>[kvmagent]: add sync VM clock cron task handler
<feature>[kvmagent]: add sync VM clock cron task handler

When host agent receive command of synchronizing VM clock task,
the synchronized VM data will be fully updated,
and the corresponding cron task will be set

Relected: ZSTAC-46810

Change-Id: I63616d73626b756f7a7774726a71637479627061

zstackio/zstack-utility,zstackio/zstack-utility,zstackio/zstack-utility