tests: Add a simple test to check the VMM vcpu allocation

As we've done some changes in the VMM vcpu allocation, let's introduce
basic tests to make sure that we're getting the expected behaviour.

The test consists in checking 3 scenarios:
* default_vcpus = 0 | no limits set
  * this should allocate 1 vcpu
* default_vcpus = 0.75 | limits set to 0.25
  * this should allocate 1 vcpu
* default_vcpus = 0.75 | limits set to 1.2
  * this should allocate 2 vcpus

The tests are very basic, but they do ensure we're rounding things up to
what the new logic is supposed to do.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

tests/integration/kubernetes/runtimeclass_workloads/pod-sandbox-vcpus-allocation.yaml

@@ -0,0 +1,54 @@
+#
+# Copyright (c) 2023 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: vcpus-less-than-one-with-no-limits
+  annotations:
+    io.katacontainers.config.hypervisor.default_vcpus: "0"
+spec:
+  runtimeClassName: kata
+  containers:
+  - name: vcpus-less-than-one-with-no-limits
+    image: quay.io/prometheus/busybox:latest
+    command: ['nproc', '--all']
+  restartPolicy: Never
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: vcpus-less-than-one-with-limits
+  annotations:
+    io.katacontainers.config.hypervisor.default_vcpus: "0.75"
+spec:
+  runtimeClassName: kata
+  containers:
+  - name: vcpus-less-than-one-with-limits
+    image: quay.io/prometheus/busybox:latest
+    resources:
+      limits:
+        cpu: "0.25"
+    command: ['nproc', '--all']
+  restartPolicy: Never
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: vcpus-more-than-one-with-limits
+  annotations:
+    io.katacontainers.config.hypervisor.default_vcpus: "0.75"
+spec:
+  runtimeClassName: kata
+  containers:
+  - name: vcpus-more-than-one-with-limits
+    image: quay.io/prometheus/busybox:latest
+    resources:
+      limits:
+        cpu: "1.2"
+    command: ['nproc', '--all']
+  restartPolicy: Never
+---