Bug 49924

If BackupManager is used,
when a primary node is switched, 
DeltaSession#isPrimarySession is not changed to true. 

Non-primary node changes into a primary node 
when a primary node is stopped or we get a non-primary session. 

If a primary node is stopped, a primary node is switched. 
In AbstractReplicatedMap, when a primary node is switched, 
MapOwner(BackupManager)#objectMadePrimay is called. 
However, isPrimarySession does not change to true in this method. 
=====BackupManager#objectMadePrimay=====
public void objectMadePrimay(Object key, Object value) {
    if (value!=null && value instanceof DeltaSession) {
        DeltaSession session = (DeltaSession)value;
        synchronized (session) {
            session.access();
            session.endAccess();
        }
    }
}
=====

If we get a non-primary session,  a primary node is switched. 
However, isPrimarySession does not change to true. 
It is only a change of primary node.

I made a patch.
It contains the following. 
isPrimarySession is set to true in BackupManager#objectMadePrimay.
When get() is called in non-primary node, MapOwner#objectMadePrimay is called.


Best regards.