Follow-up : avoid shell command passwd, only ansible.builtin.user module

The following discussion from !22 (merged) should be addressed:

• @ulvida started a discussion: (+1 comment)

  user module now documents a way to delete password:

  To create an account with a locked/disabled password on Linux systems, set this to '!' or '*'.

  Also, for next command, passwd -e we could have used expire parameter.