Added sender parameter to initializers using msg.sender.

contracts/access/roles/CapperRole.sol

@@ -12,9 +12,9 @@ contract CapperRole is Initializable {
 
   Roles.Role private cappers;
 
-  function initialize() public initializer {
-    if (!isCapper(msg.sender)) {
-      _addCapper(msg.sender);
+  function initialize(address sender) public initializer {
+    if (!isCapper(sender)) {
+      _addCapper(sender);
     }
   }
 

contracts/access/roles/MinterRole.sol

@@ -12,9 +12,9 @@ contract MinterRole is Initializable {
 
   Roles.Role private minters;
 
-  function initialize() public initializer {
-    if (!isMinter(msg.sender)) {
-      _addMinter(msg.sender);
+  function initialize(address sender) public initializer {
+    if (!isMinter(sender)) {
+      _addMinter(sender);
     }
   }
 

contracts/access/roles/PauserRole.sol

@@ -12,9 +12,9 @@ contract PauserRole is Initializable {
 
   Roles.Role private pausers;
 
-  function initialize() public initializer {
-    if (!isPauser(msg.sender)) {
-      _addPauser(msg.sender);
+  function initialize(address sender) public initializer {
+    if (!isPauser(sender)) {
+      _addPauser(sender);
     }
   }
 

contracts/access/roles/SignerRole.sol

@@ -12,9 +12,9 @@ contract SignerRole is Initializable {
 
   Roles.Role private signers;
 
-  function initialize() public initializer {
-    if (!isSigner(msg.sender)) {
-      _addSigner(msg.sender);
+  function initialize(address sender) public initializer {
+    if (!isSigner(sender)) {
+      _addSigner(sender);
     }
   }