Remove poudriere hack for make.conf in final image.
Use more CPU's when parallelizing the ports build with poudriere.
We can change this logic later if it makes sense.  Use all the CPU's available....
if more than ten are available, use all except for 3.
Move MASTER_SITE_OVERRIDE up into nano_env
We do not provide /usr/bin/install-info in the final image.
Temporarily create a no-op /usr/bin/install-info when we install packages,
because some package installation scripts expect it to be there.