Fix WADL/PDF docs referenced in describedby links
Fix WADL/PDF docs referenced in describedby links

These compute API links were broken, previously referring to
Rackspace URLs with s/v1.0/v1.1/

The links now correctly reference long-lived locations on
docs.openstack.org.

Change-Id: I10efca2868a05982a1783688e374060acf1d0a69

n0ano/ganttclient