ADMIN: dyncookie: implement a simple dynamic cookie calculator

This utility can be useful to figure what cookie value a server will
have based on the secret, its IP and its port.

(cherry picked from commit 6807c7f6e14f79657a713e6a86513b8573ed5854)
Signed-off-by: Willy Tarreau <w@1wt.eu>
3 files changed