Add guestfs command to virtctl

Libguestfs offers a series of tools for debugging and customize disk images. The guestfs command:
  - starts a pod with libguestfs-tools
  - mounts the pvc under /disks (for filesystem based disks) or /dev/vda (for
    block based disks)
  - attach stdin/out of the container
  - once the user exits from the container, it removes the libguestfs pod

Signed-off-by: Alice Frosi <[email protected]>

pkg/virtctl/BUILD.bazel

@@ -11,6 +11,7 @@ go_library(
     deps = [
         "//pkg/virtctl/console:go_default_library",
         "//pkg/virtctl/expose:go_default_library",
+        "//pkg/virtctl/guestfs:go_default_library",
         "//pkg/virtctl/imageupload:go_default_library",
         "//pkg/virtctl/pause:go_default_library",
         "//pkg/virtctl/templates:go_default_library",

pkg/virtctl/guestfs/BUILD.bazel

@@ -0,0 +1,22 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["guestfs.go"],
+    importpath = "kubevirt.io/kubevirt/pkg/virtctl/guestfs",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//pkg/virtctl/templates:go_default_library",
+        "//pkg/virtctl/utils:go_default_library",
+        "//staging/src/kubevirt.io/client-go/kubecli:go_default_library",
+        "//vendor/github.com/spf13/cobra:go_default_library",
+        "//vendor/k8s.io/api/core/v1:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/api/resource:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
+        "//vendor/k8s.io/client-go/kubernetes:go_default_library",
+        "//vendor/k8s.io/client-go/kubernetes/scheme:go_default_library",
+        "//vendor/k8s.io/client-go/rest:go_default_library",
+        "//vendor/k8s.io/client-go/tools/clientcmd:go_default_library",
+        "//vendor/k8s.io/client-go/tools/remotecommand:go_default_library",
+    ],
+)