Ticket 48770 - Improve extended op plugin handling
    
    Bug Description: In plugin.c we had a number of in-efficenty control paths, and
    loops that were repeated.
    
    Fix Description: This reduces code duplication, and looping in un-neccesary
    places.
    
    https://fedorahosted.org/389/ticket/48770
    
    Author: wibrown
    
    Review: nhosoi (Thanks!)