Revert "[mod] test_membership_cmd: always success status code"

This reverts commit ce759a4e.
Back to previous situation, since send_documentation()
is now exiting the error code to the shell
8 jobs for !196 with 390_send_doc_exit_code in 2 minutes and 58 seconds (queued for 17 seconds)
latest detached
Status Name Job ID Coverage
  Checks
passed build #59922

00:00:29

passed format #59923

00:00:57

passed isort #59924

00:00:49

passed pyupgrade #59925

00:00:30

 
  Tests
passed tests:3.6 #59926
mille

00:00:51

passed tests:3.7 #59927
mille

00:00:47

passed tests:3.8 #59928
redshift

00:00:51

passed tests:3.9:coverage #59929
redshift

00:00:56

78.0%