Convert unnecessary storage item to static. (#3093)

* Convert unnecessary storage item to static.

* Polish

* 6 second blocks.

* Compile fixes

* Bump runtime

* Fix

* Another fix

* Import `srml_support::traits::Get`

* Export MinimumPeriod from `decl_module!`

* Remove `config` from Timestamp

* Clean up warnings

substrate/node-template/runtime/src/lib.rs

@@ -33,7 +33,6 @@ pub use runtime_primitives::BuildStorage;
 pub use timestamp::Call as TimestampCall;
 pub use balances::Call as BalancesCall;
 pub use runtime_primitives::{Permill, Perbill};
-pub use timestamp::BlockPeriod;
 pub use support::{StorageValue, construct_runtime, parameter_types};
 
 /// Alias to the signature scheme used for Aura authority signatures.
@@ -155,10 +154,14 @@ impl indices::Trait for Runtime {
 	type Event = Event;
 }
 
+parameter_types! {
+	pub const MinimumPeriod: u64 = 5;
+}
 impl timestamp::Trait for Runtime {
 	/// A timestamp: seconds since the unix epoch.
 	type Moment = u64;
 	type OnTimestampSet = Aura;
+	type MinimumPeriod = MinimumPeriod;
 }
 
 parameter_types! {
@@ -207,7 +210,7 @@ construct_runtime!(
 		UncheckedExtrinsic = UncheckedExtrinsic
 	{
 		System: system::{Module, Call, Storage, Config, Event},
-		Timestamp: timestamp::{Module, Call, Storage, Config<T>, Inherent},
+		Timestamp: timestamp::{Module, Call, Storage, Inherent},
 		Aura: aura::{Module, Config<T>, Inherent(Timestamp)},
 		Indices: indices::{default, Config<T>},
 		Balances: balances,