nethserver-samba-{update,save} events: expand krb5.conf, nsswitch.conf and pam.d/{password,system}-auth-nh templates. Refs #1746
*.spec: Require cyrus-sasl-gssapi, krb5-workstation. Refs #1746
Workgroup/Configure UI module: restored AD panel. Refs #1746
nethserver-samba-adsjoin event: create machine account on directory controller and initialize system keytabs and cronjobs. Refs #1746
smb.conf template: use Workgroup parameter prop for ADS and PDC roles only. Refs #1747
Workgroup/Configure UI module: signal nethserver-samba-adsjoin event when authentication is not required to re-expand templates and reload services. Refs #1746
Workgroup\Configure UI: removed Controller field. The value is probed by "net ads" command and pushed into /etc/hosts. Refs #1746