INTEXT-80 - FIX S3 ConnectionPoolTimeoutException

JIRA: https://jira.spring.io/browse/INTEXT-80

When synchronizing to local directory, getObject was called without
ever closing the InputStream that the SDK opens causing an
"org.apache.http.conn.ConnectionPoolTimeoutException: Timeout waiting
for connection" exception. To fix that, after synchronization, the
inputStream of the s3Object is closed, causing the s3 client to release
the connection.