Add boto3 retry to mitigate IAM throttling

Signed-off-by: Rex <shuningc@amazon.com>

Author: rexcsn

tests/integration-tests/conftest.py

@@ -26,6 +26,7 @@
 import configparser
 import pkg_resources
 import pytest
+from botocore.config import Config
 from cfn_stacks_factory import CfnStack, CfnStacksFactory
 from clusters_factory import Cluster, ClustersFactory
 from conftest_markers import (
@@ -674,7 +675,15 @@ def common_pcluster_policies(region):
 @pytest.fixture(scope="class")
 def role_factory(region):
     roles = []
-    iam_client = boto3.client("iam", region_name=region)
+    iam_client = boto3.client(
+        "iam",
+        region_name=region,
+        config=Config(
+            retries={
+                "max_attempts": 10,
+            }
+        ),
+    )
 
     def create_role(trusted_service, policies=()):
         iam_role_name = f"integ-tests_{trusted_service}_{region}_{random_alphanumeric()}"