Removed firewall-adjust action from update event. Refs #1957

Update events are designed to be invoked by nethserver yum plugin
after the RPM transaction.  The firewall-adjust action is invoked
once, after all update events have been executed.
Expand /etc/ppp/options.xl2tpd on nethserver-samba-* events. Refs #1957

/etc/ppp/options.xl2tpd must be re-expanded if ntlm_auth binary
becomes available.  Also removed pppd settings from xl2tpd.conf.
Release 1.0.0