CLOUDSTACK-5217: Attach volume fails with NPE. Made changes to make sure
the hypervisor product version is reported on startup. Also made changes
to fix attach and detach volume on scsi controller.
CLOUDSTACK-5321 Added default guest template  centos 6.4-x64 and modified hyperv systemvm template download url
CLOUDSTACK-5365 added route for mgmt cidr in the VR running on HyperV