Patch to remove dependency on boto when only using boto3

Updated with explicit check for HAS_BOTO3

lib/ansible/module_utils/ec2.py

@@ -29,6 +29,7 @@ import os
 
 try:
     import boto3
+    import botocore
     HAS_BOTO3 = True
 except:
     HAS_BOTO3 = False
@@ -129,10 +130,14 @@ def get_aws_connection_info(module, boto3=False):
         elif 'EC2_REGION' in os.environ:
             region = os.environ['EC2_REGION']
         else:
+            if not boto3:
                 # boto.config.get returns None if config not found
                 region = boto.config.get('Boto', 'aws_region')
                 if not region:
                     region = boto.config.get('Boto', 'ec2_region')
+            elif boto3 and HAS_BOTO3:
+                # here we don't need to make an additional call, will default to 'us-east-1' if the below evaluates to None.
+                region = botocore.session.get_session().get_config_variable('region')
 
     if not security_token:
         if 'AWS_SECURITY_TOKEN' in os.environ: