Infinispan's siteId field is misused in RHSSO 7.x

Issue

The following configuration is RHSSO is valid, although there is not xsite set in the configuration, what is the reason for the xsite as site:

    <transport type="TCP" socket-binding="jgroups-tcp" site="xsite"/> <!--- why site=xsite -->
    <protocol type="TCPPING">
        <property name="initial_hosts"><%= @initial_hosts %></property>
    </protocol>

This may result in the following logs being recorded, as TOPOLOGY_CHANGED causing confusion:

2021-08-03 00:58:49,849   DEBUG [org.infinispan.xsite.statetransfer.XSiteStateTransferManagerImpl] (transport-thread--p18-t3) Topology change detected! EventImpl{type=TOPOLOGY_CHANGED, pre=false, cache=Cache 'client-mappings'@aserver(site-id=xsite, rack-id=null, machine-id=null), readConsistentHashAtStart=PartitionerConsistentHash:ReplicatedConsistentHash{ns = 256, owners = (7)[aserver(site-id=xsite, rack-id=null, machine-id= null): 32, aserver(site-id=xsite, rack-id=null, machine-id=null): 37, aserver(site-id=xsite, rack-id=null, machine-id=null): 38, aserver(site-id=xsite, rack-id=null, machine-id=null): 36, aserver(site-id=xsite, rack-id=null, machine-id=null): 38, aserver(site-id=xsite, rack-id=null, machine-id=null): 38, aserver(site-id=xsite, rack-id=null, machine-id=null): 37]}, 
writeConsistentHashAtStart=PartitionerConsistentHa