logic to hide add users and stop sing users links for primary sections
some cleanup
tests
Merge branch 'feature/Sections_add3_CS' of https://github.com/Harvard-University-iCommons/icommons_lti_tools into feature/Sections_add3_CS

# By Yip, Josie
# Via Yip, Josie
* 'feature/Sections_add3_CS' of https://github.com/Harvard-University-iCommons/icommons_lti_tools:
  Update unit test based on python changes