Ticket 49389 - unable to retrieve specific cosAttribute when subtree
                   password policy is configured
    
    Bug Description:   If indirect cos is being used and a subtree password
                       policy is added, th orignal COS attributes aren't always
                       returned.  The issue is that when the subtree password
                       policy attribute was encountered during the virtual
                       attribute processing it set a flag that said the attribute
                       was operational (which is correct for the password policy
                       attr: pwdpolicysubentry).
    
                       However, this flag was accidentally carried over to the
                       following virtual attributes that were being processed.
                       Which caused those attributes to be seen as operational
                       which is why it was no longer being returned to the client.
    
    Fix Description:   Reset the prop flags before processing the next COS attribute
    
    https://pagure.io/389-ds-base/issue/49389
    
    Reviewed by: firstyear(Thanks!)