MEDIUM: server: add support for changing a server's address

Ability to change a server IP address during HAProxy run time.
For now this is provided via function update_server_addr() which
currently is not called.

A log is emitted on each change. For now we do it inconditionally,
but later we'll want to do it only on certain circumstances, which
explains why the logging block is enclosed in if(1).
2 files changed