pfsync: Add CTLFLAG_VNET to carp_demotion_factor sysctl

[email_luiz.eng.br]

Summary

When trying to avoid a CARP demotion during a pfsync service restart, I noticed that a non-default value for the net.pfsync.carp_demotion_factor sysctl was not being applied during the demotion. The CARP was always demoted by 240.

After investigating, I realized that the sysctl was using VNET_NAME() without the CTLFLAG_VNET.

Please inform me if something is wrong or missing with this revision/differential. This is the first time I'm creating one.

PR: 262983
Submitted by: Luiz Amaral <[e-mail]>

Test Plan

Setup pfsync between two hosts.

Go to one of the hosts and issue:

# sysctl net.pfsync.carp_demotion_factor=0
# service pfsync restart
# grep carp /var/log/messages

Check the grep output and confirm that during the pfsync bulk operation, the CARP was demoted by 0 instead of 240.

[kp]

Thanks for the patch!