ipsec-tools: notify the death of racoon by touching a file.

Since racoon removes SPD policies when it dies, packets from upper
VPN layers might pass through without IPSec's protection. Here we
add a mechanism to close the gap as much as possible.

Bug: 5714296
Change-Id: If5ebdea3ee1444c18e062b24db724b1575dbdf2d
1 file changed