remove passwords give warning "The 'password' argument must be encrypted for this module to work properly."

[martbhell]

TASK [ansible-role-users : Remove passwords from present users if adminremove_passwords is True] *************************************************************************
SNIPSNIPSNIP
 [WARNING]: The input password appears not to have been hashed. The 'password' argument must be encrypted for this module to work properly.

$ ansible --version
ansible 2.7.0