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

@@ -526,6 +526,7 @@ 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)