[Migration operation] [Web to Undertow] When migrating SSO configuration path should be defined as "/"

When using SSO with JBoss Web all contexts are authenticated via SSO. In case of Undertow by default are only those with the same context name.

As such :migrate operation should define path=/ when migrating SSO configuration as that makes the behaviour the same as it was in JBoss Web and thus having the server configured equivalently.