shared/downloads/virtio-win.ini: Update windows virtio ISO URL

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #1481 from autotest/virtio-win-iso-update

shared/downloads/virtio-win.ini: Update windows virtio ISO URL
unattended: RHEL-5 does not have the scsi-target-utils package
guest-os: update

Fix support for JeOS 17 unattended install, RHEL 4.9, and Fedora 20.
Fix URLs for EOLed Fedora releases.
Merge pull request #1482 from bonzini/guest-os-update

Minor guest OS updates
utils_misc: Update mount check function and fix a wrong arg in umount

When do mount check, the nfs type displays as 'nfs4' if mount
version 4 NFS server, so using regex to search the mount items.
NFS not mount is not an error, so change it to debug level.

Remove umount step as it's not make sense to do umount in mount
function.

In umount function, the second arg in utils.system() is timeout, so
fix it.

BTW, disable verbose by default for mount/umount/is_mount functions.

Signed-off-by: Yanbing Du <ydu@redhat.com>