Revert "add v32.0 wsdl, update default api_version to 32.0."

This reverts commit 0de604f53680a3048dc167371bf3e0b1d0ed16e6.
Revert "add v31.0 wsdl, update default api_version to 31.0."

This reverts commit 54ae6d6dfe5778825a5bf9917c912e394b49da4e.