[package] ppp:

[package] ppp:
	- make pppd shutdown more robust as pptp hangs when the underlying connection is gone
	- don't rely on pid files generated by pppd, they're missing if the link is done, generate a per-instance pidfile with ssd instead

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@21387 3c298f89-4303-0410-b956-a3cf2f4a3e73