remote: daemon: Make sure that JSON symbols are properly loaded at startup
    
    Explicitly call virJSONInitialize at startup of the libvirt daemon so
    that we are sure that the symbols in the compat library are properly
    loaded. This will prevent any random failure from happening later on
    when the daemon would want to use the JSON parser.
    
    Signed-off-by: Peter Krempa <pkrempa@redhat.com>