ipaclient_setup_sssd: Update and cleanup

ipaclient_setup_sssd is now using configure_sssd_conf from
ipaclient/install/client.py instead. This simplified the module a lot
and also adds more configuratino options for sssd.

These are new config options supported by ipaclient_setup_sssd:

ipaclient_no_sudo
ipassd_fixed_primary
ipassd_permit
ipassd_enable_dns_updates
ipassd_no_krb5_offline_passwords
ipassd_preserve_sssd

These variables have been added to ipaclient/defaults/main.yml.