Ticket #505 - use lock-free access name2asi and oid2asi tables (additional)
    
    Bug description: commit 9c36be0540beebaca2be300b53c63b1c238ba4a7
    introduced "lazy attribute type initialization".  When searching,
    operational attributes in the returned entry had no chance to
    get initialized with the syntax, where the fact that the attribute
    is operational is set.  Due to the missing info, the operational
    attributes are unconditionally returned to the client.
    
    Fix description: This patch adds the attribute type initialization
    to slapi_vattr_list_attrs, which is called from the sending search
    result code.
    
    https://fedorahosted.org/389/ticket/505
    
    Reviewed by Rich and Ludwig (Thank you!!)