ad-auth: new implementation using sssd

ad-auth/files/pam/mkhomedir

ad-auth/files/pam/umask

ad-auth/handlers/main.yml

ad-auth/tasks/kerberos.yml

ad-auth/tasks/ldap.yml

ad-auth/tasks/main.yml

ad-auth/tasks/nscd.yml

ad-auth/tasks/nslcd.yml

ad-auth/tasks/pam.yml

ad-auth/tasks/sssd.yml

ad-auth/tasks/sudo.yml

ad-auth/templates/krb5.conf.j2

ad-auth/templates/ldap.conf.j2

ad-auth/templates/nslcd.conf.j2

ad-auth/templates/sssd.conf.j2