Updated sodor3stage Dockerfile to require  TOPLEVEL as an ARG to docker build to maximimize code/configuration reuse. Also mapped generate-hdl script to PATH rather than copying it to the /scripts folder for easier debugging.
Updated sodor3stage Dockerfile to require  TOPLEVEL as an ARG to docker build to maximimize code/configuration reuse. Also mapped generate-hdl script to PATH rather than copying it to the /scripts folder for easier debugging.

Signed-off-by: timothytrippel <580026a4889dc6e41b7e2d433baf68cf23e8b590@umich.edu>

googleinterns/hw-fuzzing,googleinterns/hw-fuzzing,googleinterns/hw-fuzzing,googleinterns/hw-fuzzing