tests: Consolidate live migration tests into common scopes

Move the live migration tests themselves into the common scopes allowing
the tests to now run interleaved together hopefully reducing CI time.

On MSHV the live migration tests are now not compiled in rather than
compiled in and skipped (as the helpers are not compiled in for MSHV.)

Assisted-by: Claude:Opus-4.7
Signed-off-by: Rob Bradford <rbradford@meta.com>

cloud-hypervisor/tests/common/utils.rs

@@ -5,7 +5,9 @@ use std::collections::HashMap;
 use std::fs::{File, OpenOptions};
 use std::io::{BufRead, Read, Seek, SeekFrom, Write};
 use std::path::{Path, PathBuf};
-use std::process::{Child, Command, Stdio};
+#[cfg(not(feature = "mshv"))]
+use std::process::Stdio;
+use std::process::{Child, Command};
 use std::string::String;
 use std::sync::mpsc;
 use std::sync::mpsc::Receiver;
@@ -14,6 +16,7 @@ use std::{cmp, fs, io, thread};
 
 use test_infra::*;
 use vmm_sys_util::tempdir::TempDir;
+#[cfg(not(feature = "mshv"))]
 use wait_timeout::ChildExt;
 
 const QCOW2_INCOMPATIBLE_FEATURES_OFFSET: u64 = 72;
@@ -1061,6 +1064,7 @@ pub(crate) fn bdf_from_hotplug_response(
     (segment_id, bus_id, device_id, function_id)
 }
 
+#[cfg(not(feature = "mshv"))]
 pub(crate) fn start_live_migration(
     migration_socket: &str,
     src_api_socket: &str,
@@ -1146,6 +1150,7 @@ pub(crate) fn start_live_migration(
     send_success && receive_success
 }
 
+#[cfg(not(feature = "mshv"))]
 pub(crate) fn print_and_panic(
     src_vm: Child,
     dest_vm: Child,