Allow contract constructors in chain spec (#3932)

* constructor spec

* execute under wrong address

* create under correct address

* revert

* move genesis block lookup

* remove env_logger

json/src/spec/account.rs

@@ -32,8 +32,10 @@ pub struct Account {
 	pub nonce: Option<Uint>,
 	/// Code.
 	pub code: Option<Bytes>,
-	/// Storage
+	/// Storage.
 	pub storage: Option<BTreeMap<Uint, Uint>>,
+	/// Constructor.
+	pub constructor: Option<Bytes>,
 }
 
 impl Account {

json/src/spec/state.rs

@@ -18,6 +18,7 @@
 
 use std::collections::BTreeMap;
 use hash::Address;
+use bytes::Bytes;
 use spec::{Account, Builtin};
 
 /// Blockchain test state deserializer.
@@ -29,7 +30,15 @@ impl State {
 	pub fn builtins(&self) -> BTreeMap<Address, Builtin> {
 		self.0
 			.iter()
-			.filter_map(|ref pair| pair.1.builtin.clone().map(|b| (pair.0.clone(), b.clone())))
+			.filter_map(|(add, ref acc)| acc.builtin.clone().map(|b| (add.clone(), b)))
+			.collect()
+	}
+
+	/// Returns all constructors.
+	pub fn constructors(&self) -> BTreeMap<Address, Bytes> {
+		self.0
+			.iter()
+			.filter_map(|(add, ref acc)| acc.constructor.clone().map(|b| (add.clone(), b)))
 			.collect()
 	}
 }