TestCmd.py: Delay cleanup registration with atexit to avoid exessive             tracebacks when Import fails because of missing pywin32             modules (see http://bugs.python.org/issue16718)
TestCmd.py: Delay cleanup registration with atexit to avoid exessive
            tracebacks when Import fails because of missing pywin32
            modules (see http://bugs.python.org/issue16718)

Distrotech/scons,Distrotech/scons,Distrotech/scons,Distrotech/scons,Distrotech/scons