s3_store_host parameter with port number

Handle to specify s3_store_host parameter with port
number. It was able to do that but not working as
expected now due to recent BOTO changes.

Change-Id: Ic6dda40886bc3fd717ec57b31ee89b935a962ab7
Closes-Bug: 1370989
Merge "s3_store_host parameter with port number"