The main script is setting PATH to use id executable from rather
strange directory.  That allowed checks to run without root
privilege.  This change will make detection whether test run is
been requested more universal, and to work without super setting
id command.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

RWMJ:
  - Use -ne instead of != to compare integers.

This updates commit 3ea952163f0c28cd88f8473bb015df892c4247bf.

See also:
https://bugzilla.redhat.com/show_bug.cgi?id=707508

Thanks Alexander Todorov for access to the hardware.

Xen IA64 HVM does not provide a simple way to detect the
hypervisor.

If we are lucky and PV-on-HVM drivers are installed and loaded,
then there will be a /sys/bus/xen directory.

Otherwise we add a timing attack to see if we can detect generic
virtualization.  Since this is a big hack, it is only enabled on IA64
and only used when all other methods of detection have failed.

This commit also adds `uname -p` to all tests (enabling arch detection
so we only run the above tests on IA64).

Data was collected by RWMJ from IBM eServer BladeCenter JS12 server,
running a PowerVM Lx86 Virtual x86 Environment (VxE) guest.

Data collected from a RHEL 5.6 guest running on Hyper-V.

Also this modifies the VirtualPC test slightly to distinguish
it from Hyper-V.  We require more data from a real VirtualPC
guest to properly refine this test.