Passing the connection_options parameter to underlying Fog::Storage object.

This aids in scenarios where you want to maintain the s3.amazonaws.com hostname
(for S3 client compatibility), but want to store data in Riak CS.
Passing the connection_options parameter to underlying Fog::Storage object
for Fog::RiakCS::Provisioning.
Merge pull request #1919 from hectcastro/hc-riakcs-usage-connection-options

Passing the connection_options parameter to underlying Fog::Storage in Fog::RiakCS::Usage