Change path in netmap_test

 See rust-lang/cargo#2728

Author: Alexander Polakov

netmap_test/Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Alexander Polyakov <apolyakov@beget.ru>"]
 build = "build.rs"
 
 [dependencies.netmap_sys]
-path = "../../netmap_sys"
+path = ".."
 features = [ "netmap_with_libs" ]
 
 [dependencies]