[packages] multiwan:

[packages] multiwan:
1. option 'health_monitor' 'serial' starts only one background process to monitor the health of
   any number of wan's, saving system resources (WHR-HP-G54 with only 16 MB memory is a happy wimp :)
2. option 'icmp_count' '3' can be useful to reduce false positives
3. a sample 'mwanfw' for VoIP traffic
4. "/etc/init.d/multiwan single" restores to the initial state of single wan.
   The "stop" command didn't quite do that, and it's now only good for process shutdown
5. numerous minor code cleanups

git-svn-id: svn://svn.openwrt.org/openwrt/packages@23388 3c298f89-4303-0410-b956-a3cf2f4a3e73