client: escape bucket and object names used in urls
client: escape bucket and object names used in urls

Convert to utf8 since urllib doesn't handle unicode well in python 2.

Signed-off-by: Josh Durgin <51652c783f70f5b272ebd02f1fd20d3af7a2449f@inktank.com>

ceph/radosgw-agent,ceph/radosgw-agent