Added paging on search facet.
    
    The search facet has been modified to support paging on most entities
    using the --pkey-only option to get the primary keys and a batch command
    to get the complete records.
    
    Paging on DNS records is not supported because a record may appear as
    multiple rows. The following entities do not have --pkey-only option:
    Automount Key, Self-Service Permissions, Delegation.
    
    The search and association facet have been refactored to reuse the
    common code from the table facet base class.
    
    Ticket #981