[rackspace|compute] remove erroneous block argument to get_object
fixes #1588
[hp/openstack|compute] remove erroneous block argument to get_object; fixes issue #1588 for OpenStack and HP
Merge pull request #1589 from rackspace/block_fix

[hp/openstack|compute] remove erroneous block argument to get_object; fi...
[cloudsigma] Add CloudSigma compute provider