Removed deletion of salt param from lookup file by 'password' lookup_filter.
Old behaviour leads to constant changed status when two tasks uses same lookup,
one with 'encrypt' parameter, and other without.

For example:

    tasks:
      - name: Create user
        user:
          password: "{{ lookup('password', inventory_dir + '/creds/user/pass' ncrypt=sha512_crypt) }}"
          ...
    # Lookup file 'creds/user/pass' now contain password with salt
      - name: Create htpasswd
        htpasswd:
          password: "{{ lookup('password', inventory_dir + '/creds/user/pass') }}"
          ...
    # Salt gets deleted from lookup file 'creds/user/pass'
    # Next run of "Create user" task will create it again and will have 'changed' status