site: support multiple transforms

[secnet] / test-example / common.conf

log logfile {
        filename "/dev/tty";
        class "info","notice","warning","error","security","fatal";
};
system {
};
resolver adns {
};
log-events "all";
random randomfile("/dev/urandom",no);
transform eax-serpent { }, serpent256-cbc { };
include test-example/sites.conf
sites map(site,vpn/test-example/all-sites);