fixes#19648
AWS S3 returns the actual object size as part of XML
response for InvalidRange error, this is used apparently
by SDKs to retry the request without the range.
The new call combines GetObjectInfo and GetObject, and returns an
object with a ReadCloser interface.
Also adds a number of end-to-end encryption tests at the handler
level.
Harshavardhana
Poorna
kannappanr
Aditya Manthramurthy