Summary: KVM - Add virtio-serial device to libvirt xml for system vms

Detail: This device can be used for remotely controlling the system vms through
a local socket on the host. We will attempt to replace the KVM patchdisk with
it. Tested, successfully deploys VM, and if system vm has proper driver it
will create a /dev/vport0p1 device within the VM. We will be updating the
system VM in 4.2/5.0 and will support this.

Signed-off-by: Marcus Sorensen <marcus@betterservers.com> 1362527352 -0700
CLOUDSTACK-1522: Add timestamp to lock

Use higher precision timestamp rather than file timestamp to find out the order
of lock requester
CLOUDSTACK-1521: Stop services after switch to BACKUP