kata-env: Fix amd64 VM container capable check

Fix nasty bug which resulted in `kata-env` showing
`VMContainerCapable = true` even on amd64 systems without virtualisation
support (thankfully `kata-check` still showed the correct results).

Added arch-specific tests to avoid any possibility of regression.

Fixes #660.

Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>

cli/kata-check_generic_test.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2018 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+// +build arm64 ppc64le
+
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func testSetCPUTypeGeneric(t *testing.T) {
+	assert := assert.New(t)
+
+	savedArchRequiredCPUFlags := archRequiredCPUFlags
+	savedArchRequiredCPUAttribs := archRequiredCPUAttribs
+	savedArchRequiredKernelModules := archRequiredKernelModules
+
+	defer func() {
+		archRequiredCPUFlags = savedArchRequiredCPUFlags
+		archRequiredCPUAttribs = savedArchRequiredCPUAttribs
+		archRequiredKernelModules = savedArchRequiredKernelModules
+	}()
+
+	assert.Empty(archRequiredCPUFlags)
+	assert.Empty(archRequiredCPUAttribs)
+	assert.NotEmpty(archRequiredKernelModules)
+
+	setCPUtype()
+
+	assert.Equal(archRequiredCPUFlags, savedArchRequiredCPUFlags)
+	assert.Equal(archRequiredCPUAttribs, savedArchRequiredCPUAttribs)
+	assert.Equal(archRequiredKernelModules, savedArchRequiredKernelModules)
+}