splitting part of util into smaller crates (#4956)

* split path module from util

* moved RotatingLogger from util to logger crate

* fix tests

* fix tests

* use only one version of ansi_term crate

util/network/src/lib.rs

@@ -71,6 +71,8 @@ extern crate ethkey;
 extern crate ethcrypto as crypto;
 extern crate rlp;
 extern crate bytes;
+extern crate path;
+extern crate ethcore_logger;
 
 #[macro_use]
 extern crate log;