Ticket 49002 - Remove memset on allocation
    
    Bug Description:  Memset is slow, and has cause us some issues. c99 supports
    allocing 0 structs with {0}, and we can also use calloc when needed. Calloc is
    signifigantly faster that malloc + memset.
    
    Fix Description:  Remove memset where possible. We can't remove it universally
    due to some struct reuse, and some libraries needing it, but this reduction
    cleans the code greatly, and should give us a perf improvement.
    
    https://fedorahosted.org/389/ticket/49002
    
    Author: wibrown
    
    Review by: mreynolds (Thanks!)