JCLOUDS-457: BlobStore MultiPartUpload strategy

The code related to the MultiPartUpload strategy has been added.
MultiPart uploads use an upload strategy (e.g. sequential vs parallel)
and also a slicing strategy to split the payload in different parts.
JCLOUDS-457: Long live tests

The long live tests have been added. These tests takes several
hours and will leave traces in your AWS account.
JCLOUDS-457: List containers and remove blob

List containers and remove blob operations have
been added.