patch to support setting carp state with ifconfig

[Nick Barkas]

Hello-
A few months ago I wrote a small patch that allows ifconfig to  
explicitly set a carp device to MASTER or BACKUP state. The code is  
based upon OpenBSD's ifconfig, which has this feature. This is handy  
for situations where you want an active carp interface to fail over  
to/take over from the other host, perhaps for testing purposes or if  
you have a failed master you've brought back up that you want to take  
over again for a currently active slave host.

The patch is attached to this PR: http://www.freebsd.org/cgi/query- 
pr.cgi?pr=100956. No one has sent any followups to the PR, but I  
thought there may be someone on this list interested in having this  
feature added.

Nick