message: Fix the new yield_impl unit tests to use the zero-argument fake::Kernel::new().
diff: @@ -19,7 +19,7 @@ fn yield_no_wait_test() {
  .expect("wrong panic payload type")
  .contains("no fake::Kernel"));
  - let kernel = fake::Kernel::new("yield_no_wait_test");
  + let kernel = fake::Kernel::new();
  // Test yield_no_wait with an empty upcall queue and empty expected syscall
  // queue.
  @@ -69,7 +69,7 @@ fn yield_wait_test() {
  .expect("wrong panic payload type")
  .contains("no fake::Kernel"));
  - let kernel = fake::Kernel::new("yield_wait_test");
  + let kernel = fake::Kernel::new();
  // Test yield_wait with a mismatched expected syscall.
  kernel.add_expected_syscall(ExpectedSyscall::YieldNoWait {
  @@ -93,7 +93,7 @@ fn yield_wait_test() {
  #[test]
  fn yield1() {
  - let kernel = fake::Kernel::new("yield1");
  + let kernel = fake::Kernel::new();
  #[cfg(target_pointer_width = "64")]
  {
  @@ -133,7 +133,7 @@ fn yield1() {
  // Tests RawSyscalls::yield2's handling of bad yield IDs.
  #[test]
  fn yield2() {
  - let kernel = fake::Kernel::new("yield2");
  + let kernel = fake::Kernel::new();
  #[cfg(target_pointer_width = "64")]
  {
  