Add s3 client

This is needed to obtain bucket's creation time as follows

    s3_client.get_bucket_tagging(Bucket=bucket.name)

In the future, it might be replaced by resourcegroupstaggingapi

Signed-off-by: Andrej Podhradsky <apodhrad@redhat.com>

wrapanapi/systems/ec2.py

@@ -498,6 +498,7 @@ def __init__(self, **kwargs):
         self.sqs_connection = boto3client('sqs', **connection_kwargs)
         self.elb_connection = boto3client('elb', **connection_kwargs)
         self.s3_connection = boto3resource('s3', **connection_kwargs)
+        self.s3_client = boto3client('s3', **connection_kwargs)
         self.ec2_connection = boto3client('ec2', **connection_kwargs)
         self.ec2_resource = boto3resource('ec2', **connection_kwargs)
         self.ecr_connection = boto3client('ecr', **connection_kwargs)