When supplying a jgroups configuration in the infinispan.xml file none of the properties that have a nested attribute are applied.

For example the default-jgroups.xml file has the attribute `thread_pool.max_threads="${jgroups.thread_pool.max_threads:200}"`. This means the default should be 200 if it is not supplied. However due to the extra dot in `thread_pool.max_threads` it isn't applied to properly and only the default is applied.

I found this by trying to add the below snippet and the heap dump still showed the value as 0.

    <stack name="my-stack" extends="tcp">
      <TCP msg_processing_policy.max_buffer_size="1000" stack.combine="COMBINE"/>
    </stack>

The problem stems from the invocation of `Configurator.initializeAttrs` at https://github.com/infinispan/infinispan/blob/main/core/src/main/java/org/infinispan/remoting/transport/jgroups/EmbeddedJGroupsChannelConfigurator.java#L91 which doesn't look at the nested attributes.