Vendor dependencies for 0.3.0 release

vendor/nix/test/sys/test_sysinfo.rs

@@ -0,0 +1,20 @@
+use nix::sys::sysinfo::*;
+
+#[test]
+fn sysinfo_works() {
+    let info = sysinfo().unwrap();
+
+    let (l1, l5, l15) = info.load_average();
+    assert!(l1 >= 0.0);
+    assert!(l5 >= 0.0);
+    assert!(l15 >= 0.0);
+
+    info.uptime(); // just test Duration construction
+
+    assert!(
+        info.swap_free() <= info.swap_total(),
+        "more swap available than installed (free: {}, total: {})",
+        info.swap_free(),
+        info.swap_total()
+    );
+}