Revert wrongly pushed config files

This reverts commit d586898cbafe4ffca53fa455c6d9c75988e1964d partially.
Add cleanup of connection pool resource
Add a riak_test test case for simple disjoint bag configuration

All new buckets are assigned bag-B to store manifests and
all new manifests are assigned bag-C to store blocks.

| bag   | manfiest |   block |
|-------+----------+---------|
| bag-A |  default | default |
| bag-B |      100 |     --- |
| bag-C |      --- |     100 |

Under this configuration, assert manifests and blocks are
stored to expected bags and whole contents throught S3 API.