Fix the problem that part of the sdk's unit test do not block CI when they fail (#827)

fix unittest err exit

test/unittest.sh

 #!/bin/bash
+set -e
 CWD=${PWD}
 
 # -------------For python unittest-------------
@@ -25,4 +26,4 @@ python3 -m unittest discover -v tests
 cd ${CWD}/../src/nni_manager
 echo ""
 echo "===========================Testing: nni_manager==========================="
-npm run test
\ No newline at end of file
+npm run test