Added redirect_uri to OAuth credentials

Author: casey-tran

pkg/pb/credentialspb/credentials.pb.go

@@ -40,6 +40,7 @@ message Oauth2 {
   string client_id = 2;
   string client_secret = 3;
   string access_token = 4;
+  string redirect_uri = 5;
 }
 
 message KeySecret {
@@ -49,7 +50,7 @@ message KeySecret {
 
 message AWSSessionTokenSecret {
   string key = 1 [(validate.rules).string.min_len = 1];
-  string secret = 2 [(validate.rules).string.min_len = 1]; 
+  string secret = 2 [(validate.rules).string.min_len = 1];
   string session_token = 3 [(validate.rules).string.min_len = 1];
 }