get-my-ip.py: Add nesting setup/get-my-ip/

Mimic the path that submodule users will have.

diff --git a/setup/get-my-ip.py b/setup/get-my-ip/get-my-ip.py
similarity index 100%
rename from setup/get-my-ip.py
rename to setup/get-my-ip/get-my-ip.py