MFC: etc/rc.d/ppp,v1.14 and etc/defaults/rc.conf,v1.319

MFC: etc/rc.d/ppp,v1.14 and etc/defaults/rc.conf,v1.319

Teach /etc/rc.d/ppp to start multiple instances of ppp.

ppp_profile variable can now contain multiple profiles.
Overrides for ppp mode and nat can go into ppp_$profile_mode
and ppp_$profile_nat variables respectively. If those are
not specified, defaults from ppp_mode and ppp_nat are used.

MFC: etc/rc.d/ppp v1.15

Teach /etc/rc.d/ppp how to start/stop individual instances
of ppp. This is an extension of previous commit.

Submitted by:	Yuri Kurenkov < y dot kurenkov at init dot ru >
Reviewed by:	mtm
Approved by:	re (kensmith)