Make the kernel_copy tests more robust/concurrent.

These tests write to the same filenames in /tmp and in some cases these
files don't get cleaned up properly. This caused issues for us when
different users run the tests on the same system, e.g.:

```
---- sys::unix::kernel_copy::tests::bench_file_to_file_copy stdout ----
thread 'sys::unix::kernel_copy::tests::bench_file_to_file_copy' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }', library/std/src/sys/unix/kernel_copy/tests.rs:71:10
---- sys::unix::kernel_copy::tests::bench_file_to_socket_copy stdout ----
thread 'sys::unix::kernel_copy::tests::bench_file_to_socket_copy' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 13, kind: PermissionDenied, message: "Permission denied" }', library/std/src/sys/unix/kernel_copy/tests.rs:100:10
```

Use `std::sys_common::io__test::tmpdir()` to solve this.

library/std/src/sys/unix/kernel_copy/tests.rs

@@ -1,18 +1,18 @@
-use crate::env::temp_dir;
 use crate::fs::OpenOptions;
 use crate::io;
 use crate::io::Result;
 use crate::io::SeekFrom;
 use crate::io::{BufRead, Read, Seek, Write};
 use crate::os::unix::io::AsRawFd;
+use crate::sys_common::io::test::tmpdir;
 
 #[test]
 fn copy_specialization() -> Result<()> {
     use crate::io::{BufReader, BufWriter};
 
-    let path = crate::env::temp_dir();
-    let source_path = path.join("copy-spec.source");
-    let sink_path = path.join("copy-spec.sink");
+    let tmp_path = tmpdir();
+    let source_path = tmp_path.join("copy-spec.source");
+    let sink_path = tmp_path.join("copy-spec.sink");
 
     let result: Result<()> = try {
         let mut source = crate::fs::OpenOptions::new()
@@ -61,7 +61,8 @@ fn copy_specialization() -> Result<()> {
 #[bench]
 fn bench_file_to_file_copy(b: &mut test::Bencher) {
     const BYTES: usize = 128 * 1024;
-    let src_path = temp_dir().join("file-copy-bench-src");
+    let temp_path = tmpdir();
+    let src_path = temp_path.join("file-copy-bench-src");
     let mut src = crate::fs::OpenOptions::new()
         .create(true)
         .truncate(true)
@@ -71,7 +72,7 @@ fn bench_file_to_file_copy(b: &mut test::Bencher) {
         .unwrap();
     src.write(&vec![0u8; BYTES]).unwrap();
 
-    let sink_path = temp_dir().join("file-copy-bench-sink");
+    let sink_path = temp_path.join("file-copy-bench-sink");
     let mut sink = crate::fs::OpenOptions::new()
         .create(true)
         .truncate(true)
@@ -90,7 +91,8 @@ fn bench_file_to_file_copy(b: &mut test::Bencher) {
 #[bench]
 fn bench_file_to_socket_copy(b: &mut test::Bencher) {
     const BYTES: usize = 128 * 1024;
-    let src_path = temp_dir().join("pipe-copy-bench-src");
+    let temp_path = tmpdir();
+    let src_path = temp_path.join("pipe-copy-bench-src");
     let mut src = OpenOptions::new()
         .create(true)
         .truncate(true)
@@ -121,7 +123,8 @@ fn bench_file_to_socket_copy(b: &mut test::Bencher) {
 #[bench]
 fn bench_file_to_uds_copy(b: &mut test::Bencher) {
     const BYTES: usize = 128 * 1024;
-    let src_path = temp_dir().join("uds-copy-bench-src");
+    let temp_path = tmpdir();
+    let src_path = temp_path.join("uds-copy-bench-src");
     let mut src = OpenOptions::new()
         .create(true)
         .truncate(true)