* add sigopt hpo to transformers. Signed-off-by: Ding, Ke <ke.ding@intel.com> * extend sigopt changes to test code and others.. Signed-off-by: Ding, Ke <ke.ding@intel.com> * Style. * fix style for sigopt integration. Signed-off-by: Ding, Ke <ke.ding@intel.com> * Add necessary information to run unittests on SigOpt. Co-authored-by: Morgan Funtowicz <funtowiczmo@gmail.com>