ch test: Check if /dev/kvm exist (#3866)

With older baremetal server, lscpu wont expose virtualisation
feature details (VT-x or AMD-V)

This will cause CH test to be skipped when runs on Ubuntu-KVM
with older generation windows machine.

Fix it by checking if /dev/kvm exist

Signed-off-by: Smit Gardhariya <sgardhariya@microsoft.com>

Author: smit-gardhariya

microsoft/testsuites/cloud_hypervisor/ch_tests.py

@@ -168,7 +168,8 @@ def verify_cloud_hypervisor_performance_metrics_tests(
     def _ensure_virtualization_enabled(self, node: Node) -> None:
         virtualization_enabled = node.tools[Lscpu].is_virtualization_enabled()
         mshv_exists = node.tools[Ls].path_exists(path="/dev/mshv", sudo=True)
-        if not virtualization_enabled and not mshv_exists:
+        kvm_exists = node.tools[Ls].path_exists(path="/dev/kvm", sudo=True)
+        if not virtualization_enabled and not mshv_exists and not kvm_exists:
             raise SkippedException("Virtualization is not enabled in hardware")
         # add user to mshv group for access to /dev/mshv
         if mshv_exists: