Ensure VMware snapshot quiesces VMs

The VMware snapshot feature will no longer instruct VMware to create a app-consistent snapshot before the ZFS snapshot was taken, which I believe was the exact purpose of this feature.

Specifically, in source code ( https://github.com/freenas/freenas/blob/master/gui/tools/autosnap.py ) line 452-456

Code:

VimTask.WaitForTask(vm.CreateSnapshot_Task(
name=vmsnapname,
description=vmsnapdescription,
memory=False, quiesce=False,
))

both have been set to false.

See fourm https://www.ixsystems.com/community/threads/vmware-coordinated-snapshot-not-working-properly.76528/#post-533091 post for more detailes.