Use explicit global namespaces in codegen (#1928)

* ipc as a deault feature

* first part of purge

* second part of ns purge

ipc/tests/binary.rs.in

@@ -16,8 +16,6 @@
 
 
 use ipc::*;
-use std::mem;
-use std::collections::VecDeque;
 use util::Bytes;
 
 #[derive(Binary)]

ipc/tests/nested.rs.in

@@ -16,9 +16,6 @@
 
 use std::sync::RwLock;
 use ipc::IpcConfig;
-use std::mem;
-use ipc::binary::BinaryConvertError;
-use std::collections::VecDeque;
 
 pub struct DB<L: Sized> {
 	pub writes: RwLock<u64>,

ipc/tests/service.rs.in

@@ -16,9 +16,6 @@
 
 use std::sync::RwLock;
 use ipc::IpcConfig;
-use std::mem;
-use ipc::binary::BinaryConvertError;
-use std::collections::VecDeque;
 
 pub struct Service {
 	pub commits: RwLock<usize>,

ipc/tests/with_attrs.rs.in

@@ -15,9 +15,6 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use ipc::IpcConfig;
-use std::mem;
-use ipc::binary::BinaryConvertError;
-use std::collections::VecDeque;
 
 pub struct BadlyNamedService;