Finished release v0.2.33.

* release/v0.2.33:
  Revert "Return vendor specific data from standard inquiry"
  Return vendor specific data from standard inquiry
  buildout.cfg: changed isolated python version to v2.7.6.20
  buildout.cfg: changed isolated python version to v2.7.6.19
  HIP-1340 adding docstrings
  HIP-1338 adapting storagemodel to interface change in infi.exceptools
  HIP-1334 changing method name to check_if_write_protected
  HIP-1334 implementing InfiniBoxVolumeMixin.is_read_only
  STORAGEMODEL-305 changing LinuxNativeMultipathBlockDevice.get_display_name
  STORAGEMODEL-304 adding another test
  STORAGEMODEL-304 implementing infi.storagemodel.infinidat.infinibox.wwn:InfinidatWWN