Docker compiler adds extra newline to file content

[lschulz]

While working on the SCION layer I noticed that the Docker compiler adds an
extra newline to file contents set with Node.setFile().

The problem is in

seed-emulator/seedemu/compiler/Docker.py

Line 724 in 5125ccf

print(content, file=open(staged_path, 'w'))

The file contents are staged with print which adds a newline at the end of what was printed.

I would suggest changing the line to
print(content, end='', file=open(staged_path, 'w'))
to avoid the newline.

[wonkr]

fixed in Development branch : 0c4282f

[wonkr]

Merged into main branch.

[kevin-w-du]

We revert this change, because the affected function is used in a number of places, some of which probably assume that there is a return at the end. This breaks the emulator. We will look at this issue again and find a better way to address it.