rgw: RGWRESTSimpleRequest::forward_request params

rgw: RGWRESTSimpleRequest::forward_request params

forward_request() uses new_info.build_from(info) to initialize the new
request info. but this doesn't copy the RGWHTTPArgs, so any parameters
associated with info are dropped

it later uses new_info.args.get_params() to generate the params_str,
but no code in between adds any parameters to new_info. so use
info.args.get_params() instead to keep any parameters from the original
request info

Signed-off-by: Casey Bodley <cbodley@redhat.com>