pwgen -n 15 -c 1
soo2Echu7SooLao

using new python3:
python3 -c "import crypt; print(crypt.crypt('soo2Echu7SooLao', '\$6\$eyoo3seivengu3cei'))"
$6$eyoo3seivengu3ce$U30IkaHvd9Zmf4PPl1ZVR0G4coP6JZFwW/uxMkiVZV8vL2WjZaYrmsalfJ9snLjGR8rGKhCEyZpX5cRhAIf.R0

using old python2:
python -c 'import crypt; print crypt.crypt("soo2Echu7SooLao", "$6$saltsalt$")'

If you are getting error File "", line 1
import crypt; print crypt.crypt
SyntaxError: invalid syntax
use python3

using Perl:
perl -e 'print crypt("soo2Echu7SooLao","\$6\$saltsalt\$") . "\n"'

ansible -i inv xx.xx.xx.xx -m user -a ' name=root password=$6$eyoo3seivengu3ce$U30IkaHvd9Zmf4PPl1ZVR0G4coP6JZFwW/uxMkiVZV8vL2WjZaYrmsalfJ9snLjGR8rGKhCEyZpX5cRhAIf.R0' -k

SSH password:
xx.xx.xx.xx | success >> {
"append": false,
"changed": true,
"comment": "root",
"group": 0,
"home": "/root",
"move_home": false,
"name": "root",
"password": "NOT_LOGGING_PASSWORD",
"shell": "/bin/bash",
"state": "present",
"uid": 0
}