Update: Make environment variable handling design consistent between fake and control...

Update: Make environment variable handling design consistent between fake and controller programs.

The Featureless Make system does not have a way of passing all environment variables.
Add a flag to designate whether or not environments is empty because it is not defined or is empty because it is defined as empty just like the controller program does.

This then allows for more flexible control over whether or not the environment variable security.

Update the example setting files and fakefiles to expose PATH and LD_LIBRARY_PATH by default.