Summary: check for default ORBImpl and ORBSingleton set via properties or System properties
Reviewed-by: alanb, coffeys, mchung

Reviewed-by: erikj, tbell

8027943: serial version of com.sun.corba.se.spi.orbutil.proxy.CompositeInvocationHandlerImpl changed in 7u45
Reviewed-by: msheppar, alanb, lancea

Reviewed-by: chegar, smarks

Reviewed-by: mduigou, mchung

Reviewed-by: chegar, coffeys, smarks
Contributed-by: alan.bateman@oralce.com, mark.sheppard@oracle.com

Reviewed-by: katleman, dholmes

Reviewed-by: dholmes, chegar

Reviewed-by: tbell, simonis, erikj

Reviewed-by: ksrini, katleman

Reviewed-by: chegar, msheppar

Reviewed-by: coffeys, alanb, skoivu