Add playbooks: become_user_cfg & shutdown

"reset_connection" tip came from:
https://www.jeffgeerling.com/blog/2021/allowing-ansible-playbooks-work-new-user-groups-on-first-run

 Remove sudo passwd less add root auth w/ key

Root is accessible from:
 * SSH by key
 * sudo by password

TODO: if keychain is waiting for passphrase, ansible hang
https://www.funtoo.org/Keychain#Quick_Setup