By default, optimistic locking caches do not enable write skew. This was already spotted in ISPN-3655.

In an embedded environment, the user can always enable write skew in its configuration, but this cannot be enabled in server mode.

Widlfly does enable write skew programmatically depending on the configuration:

    > hey, quick q: can you configure writeSkew on infinispan wildfly
    config?
    <pferraro> we always enable write skew for synchronous, optimistic,
    repeatable-read caches, and disable otherwise
    > pferraro: ah, you do it in the integration code?
    <pferraro> yes

We need to be doing the same in server configuration, otherwise we run the risk of having issues with conditional operations under failure situations (see ISPN-2956)