Make priviledged functions explicity use origin (#3045)

* Make priviledged functions explicity use `origin`

* Fix typo in docs

* Fix more tests

* Remove `root` pathway, add semicolons

substrate/srml/contracts/src/lib.rs

@@ -106,7 +106,7 @@ use srml_support::{
 	Parameter, StorageMap, StorageValue, decl_module, decl_event, decl_storage, storage::child
 };
 use srml_support::traits::{OnFreeBalanceZero, OnUnbalanced, Currency, Get};
-use system::{ensure_signed, RawOrigin};
+use system::{ensure_signed, RawOrigin, ensure_root};
 use substrate_primitives::storage::well_known_keys::CHILD_STORAGE_KEY_PREFIX;
 use timestamp;
 
@@ -485,7 +485,8 @@ decl_module! {
 		/// Updates the schedule for metering contracts.
 		///
 		/// The schedule must have a greater version than the stored schedule.
-		pub fn update_schedule(schedule: Schedule) -> Result {
+		pub fn update_schedule(origin, schedule: Schedule) -> Result {
+			ensure_root(origin)?;
 			if <Module<T>>::current_schedule().version >= schedule.version {
 				return Err("new schedule must have a greater version than current");
 			}