Fix IOError info when Getting the data at the specified URL
Fix IOError info when Getting the data at the specified URL

Raise an IOError if max_size is less than 1.
Raise an IOError if chunk_size is less than 1.

Change-Id: I53881e3ced9a3f5bf45bfb0940f97b025c0ed3e9

stackforge/solum,openstack/solum,stackforge/solum,openstack/solum