Change onlyOwner -> onlyAuthorized everywhere

contracts/staking/contracts/src/Staking.sol

@@ -54,7 +54,7 @@ contract Staking is
         address _zrxVaultAddress        
     )
         external
-        onlyOwner
+        onlyAuthorized
     {
         // DANGER! When performing upgrades, take care to modify this logic
         // to prevent accidentally clearing prior state.

contracts/staking/contracts/src/StakingProxy.sol

@@ -90,7 +90,7 @@ contract StakingProxy is
         address _zrxVaultAddress
     )
         external
-        onlyOwner
+        onlyAuthorized
     {
         _attachStakingContract(
             _stakingContract,
@@ -105,7 +105,7 @@ contract StakingProxy is
     /// Note that this is callable only by this contract's owner.
     function detachStakingContract()
         external
-        onlyOwner
+        onlyAuthorized
     {
         stakingContract = NIL_ADDRESS;
         emit StakingContractDetachedFromProxy();
@@ -114,7 +114,7 @@ contract StakingProxy is
     /// @dev Set read-only mode (state cannot be changed).
     function setReadOnlyMode(bool readOnlyMode)
         external
-        onlyOwner
+        onlyAuthorized
     {
         if (readOnlyMode) {
             stakingContract = readOnlyProxy;

contracts/staking/contracts/src/fees/MixinExchangeManager.sol

@@ -46,7 +46,7 @@ contract MixinExchangeManager is
     /// @param addr Address of exchange contract to add
     function addExchangeAddress(address addr)
         external
-        onlyOwner
+        onlyAuthorized
     {
         if (validExchanges[addr]) {
             LibRichErrors.rrevert(LibStakingRichErrors.ExchangeAddressAlreadyRegisteredError(
@@ -61,7 +61,7 @@ contract MixinExchangeManager is
     /// @param addr Address of exchange contract to remove
     function removeExchangeAddress(address addr)
         external
-        onlyOwner
+        onlyAuthorized
     {
         if (!validExchanges[addr]) {
             LibRichErrors.rrevert(LibStakingRichErrors.ExchangeAddressNotRegisteredError(

contracts/staking/contracts/src/immutable/MixinStorage.sol

@@ -21,7 +21,7 @@ pragma experimental ABIEncoderV2;
 
 import "@0x/contracts-asset-proxy/contracts/src/interfaces/IAssetProxy.sol";
 import "@0x/contracts-utils/contracts/src/LibRichErrors.sol";
-import "@0x/contracts-utils/contracts/src/Ownable.sol";
+import "@0x/contracts-utils/contracts/src/Authorizable.sol";
 import "./MixinConstants.sol";
 import "../interfaces/IZrxVault.sol";
 import "../interfaces/IEthVault.sol";
@@ -33,7 +33,7 @@ import "../libs/LibStakingRichErrors.sol";
 // solhint-disable max-states-count, no-empty-blocks
 contract MixinStorage is
     MixinConstants,
-    Ownable
+    Authorizable
 {
     // WETH Asset Proxy
     IAssetProxy public wethAssetProxy;
@@ -134,4 +134,12 @@ contract MixinStorage is
 
     // Denominator for cobb douglas alpha factor.
     uint32 public cobbDouglasAlphaDenominator;
+
+    /// @dev Adds owner as an authorized address.
+    constructor()
+        public
+        Ownable()
+    {
+        _addAuthorizedAddress(owner);
+    }
 }

contracts/staking/contracts/src/sys/MixinParams.sol

@@ -56,7 +56,7 @@ contract MixinParams is
         address _zrxVaultAddress
     )
         external
-        onlyOwner
+        onlyAuthorized
     {
         _setParams(
             _epochDurationInSeconds,

contracts/staking/contracts/src/vaults/MixinVaultCore.sol

@@ -84,7 +84,7 @@ contract MixinVaultCore is
     /// @param _stakingProxyAddress Address of Staking proxy contract.
     function setStakingProxy(address payable _stakingProxyAddress)
         external
-        onlyOwner
+        onlyAuthorized
     {
         stakingProxyAddress = _stakingProxyAddress;
         emit StakingProxySet(_stakingProxyAddress);