JCR-3754 [jackrabbit-aws-ext] Add retry logic to S3 asynchronous failed upload

Applying patch from Shashank.
-- Using parameterized logging stmts. No logic changes

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/trunk@1585460 13f79535-47bb-0310-9956-ffa450edef68