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/src/chain_spec.rs

@@ -1,6 +1,6 @@
 use primitives::{ed25519, sr25519, Pair};
 use node_template_runtime::{
-	AccountId, GenesisConfig, AuraConfig, TimestampConfig, BalancesConfig,
+	AccountId, GenesisConfig, AuraConfig, BalancesConfig,
 	SudoConfig, IndicesConfig, SystemConfig, WASM_BINARY, AuraId
 };
 use substrate_service;
@@ -97,9 +97,6 @@ fn testnet_genesis(initial_authorities: Vec<AuraId>, endowed_accounts: Vec<Accou
 		aura: Some(AuraConfig {
 			authorities: initial_authorities.clone(),
 		}),
-		timestamp: Some(TimestampConfig {
-			minimum_period: 5, // 10 second block time.
-		}),
 		indices: Some(IndicesConfig {
 			ids: endowed_accounts.clone(),
 		}),