GBE-434: on cloning ClientLayerInfo, make sure LayerExtraInfo of type ServerSideOnlyInfo is not cloned. This is important for CacheInfo object.
(cherry picked from commit 4a9cd81)
GBE-434: Make CacheInfo completely serializable (meaning make fields serializable). But prevent GWT serialization of the fields by annotation GwtTransient => this stubs functionality of interface ServerSideOnlyInfo.
Added gwt module file for enabling using CacheInfo in GWT serialization context.
(cherry picked from commit 8bac8f3)
checkstyle for server-plugin-cache-infinispan