Enable domain-wide failover cookies

We can allow a failover authentication cookie to be used by any WebSEAL server within the same domain as the WebSEAL server that creates the cookie. This feature is controlled by a stanza entry in the [failover] stanza.

By default, domain-wide failover cookie functionality is disabled:

[failover]
enable-failover-cookie-for-domain = no

To enable the domain-wide failover cookie functionality, set enable-failover-cookie-for-domain to "yes":