Moved StopGaurd to it's own crate (#7635)

Cargo.lock

@@ -486,6 +486,7 @@ dependencies = [
  "semantic_version 0.1.0",
  "snappy 0.1.0 (git+https://github.com/paritytech/rust-snappy)",
  "stats 0.1.0",
+ "stop-guard 0.1.0",
  "table 0.1.0",
  "time 0.1.38 (registry+https://github.com/rust-lang/crates.io-index)",
  "triehash 0.1.0",
@@ -2975,6 +2976,10 @@ dependencies = [
  "log 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "stop-guard"
+version = "0.1.0"
+
 [[package]]
 name = "strsim"
 version = "0.6.0"

devtools/src/lib.rs

@@ -21,9 +21,7 @@ extern crate rand;
 
 mod random_path;
 mod test_socket;
-mod stop_guard;
 pub mod http_client;
 
 pub use random_path::*;
 pub use test_socket::*;
-pub use stop_guard::*;

ethcore/Cargo.toml

@@ -53,6 +53,7 @@ kvdb-rocksdb = { path = "../util/kvdb-rocksdb" }
 kvdb-memorydb = { path = "../util/kvdb-memorydb" }
 util-error = { path = "../util/error" }
 snappy = { git = "https://github.com/paritytech/rust-snappy" }
+stop-guard = { path = "../util/stop-guard" }
 migration = { path = "../util/migration" }
 macros = { path = "../util/macros" }
 rust-crypto = "0.2.34"

ethcore/src/lib.rs

@@ -105,6 +105,7 @@ extern crate migration;
 extern crate rlp_derive;
 extern crate rustc_hex;
 extern crate stats;
+extern crate stop_guard;
 extern crate time;
 extern crate using_queue;
 extern crate table;

ethcore/src/service.rs

@@ -31,6 +31,7 @@ use miner::Miner;
 use snapshot::{ManifestData, RestorationStatus};
 use snapshot::service::{Service as SnapshotService, ServiceParams as SnapServiceParams};
 use ansi_term::Colour;
+use stop_guard::StopGuard;
 
 /// Message type for external and internal events
 #[derive(Clone, PartialEq, Eq, Debug)]
@@ -59,7 +60,7 @@ pub struct ClientService {
 	client: Arc<Client>,
 	snapshot: Arc<SnapshotService>,
 	database: Arc<Database>,
-	_stop_guard: ::devtools::StopGuard,
+	_stop_guard: StopGuard,
 }
 
 impl ClientService {
@@ -111,7 +112,7 @@ impl ClientService {
 
 		spec.engine.register_client(Arc::downgrade(&client) as _);
 
-		let stop_guard = ::devtools::StopGuard::new();
+		let stop_guard = StopGuard::new();
 
 		Ok(ClientService {
 			io_service: Arc::new(io_service),

util/stop-guard/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "stop-guard"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+
+[dependencies]