expose tcmf num_workers to zouwu (intel-analytics#2884)

* expose tcmf num_workers to zouwu

* fix style & add logger handler & default num_workers

* change backend to horovod

* change zouwu forecast base test case from ZooTestCase to TestCase

* split zouwu model forecast test into with and without ft

* change import

* change import

* change zouwu tests structure

* fix typo

* expose evaluate and fix num_workers after rebase

* change default value of num_workers

python/orca/test/dev/run-pytests-ray

@@ -52,7 +52,8 @@ then
 fi
 
 echo "Running zouwu tests"
-python -m pytest -v ../test/zoo/zouwu
+python -m pytest -v ../test/zoo/zouwu \
+       -k "not test_forecast_tcmf_distributed"
 exit_status_4=$?
 if [ $exit_status_4 -ne 0 ];
 then