Remove -u option

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Remove deprecation warnings

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Remove 'fog' as it is not being used

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Specify bucket when publishing stemcell

* ci:publish_stemcell takes extra argument publish_s3_bucket_name
* ci:publish_stemcell_in_vm takes extra argument publish_s3_bucket_name

Signed-off-by: Andrei Dinin <adinin@pivotal.io>
Signed-off-by: Edward Zhang <zhuadl@cn.ibm.com>