Description of problem:
virt-what doesn't display xen-domU for a RHEL6.8 paravirtualized guest domain on RHEL5.11 Xen host.

Version-Release number of selected component (if applicable):
Host RHEL5.11 with latest xen and kernel xen:
kernel-xen-2.6.18-408.el5
xen-3.0.3-147.el5_11

Guest RHEL6.8 with:
kernel-2.6.32-642.el6.x86_64
virt-what-1.11-1.2.el6.x86_64

How reproducible: Always

Steps to Reproduce:
1. Create a RHEL6.8 paravirtualized guest domain on RHEL5.11 Xen host.
2. Login to the guest system and run command "virt-what".

Actual results:
The result of virt-what is:
[root@dhcp-66-145-125 ~]# /usr/sbin/virt-what
xen
The other information of the guest "xen-domU" is missing.

Expected results:
The result should include the "xen-domU" information as in the man page.
[root@dhcp-66-145-125 ~]# /usr/sbin/virt-what
xen
xen-domU

Additional info:
1. The latest source code of virt-what (virt-what-1.15) has modified this issue in xen part of file virt-what.in, using this code the virt-what works as expected.

# Check for Xen.

if [ "$cpuid" = "XenVMMXenVMM" ]; then
    echo xen; echo xen-hvm
    skip_qemu_kvm=true
elif [ -d "${root}/proc/xen" ]; then
    echo xen-hypervisor
    if grep -q "control_d" "${root}/proc/xen/capabilities" 2>/dev/null; then
        echo xen-dom0; echo print-dom0
    else
        echo xen-domU; echo print-domU
    fi
    skip_qemu_kvm=true
    skip_lkvm=true
...

2. There is once a bug on RHEL6.1 https://bugzilla.redhat.com/show_bug.cgi?id=671126 which is fixed on virt-what-1.3-4.4.el6, but the directory structure of xen pv guest changed, so I suggest to change this part of code accordingly to get the exactly guest information.