Updating commotion-debug-helper to not use iwinfo or luci_splash

[jheretic]

To test:

1. Run commotion-debug-helper through the luci interface, ensure that the text file that you download contains debug output and doesn't have any blank sections or sections that only include errors. In this context, a section is a header:

---

-----------------------------------------------------------------

So should not be blank and should not just say "command not found" or something.
2. Login to the node over SSH and run 'cdh all'. Check /tmp/debug.info as above.

[hawkinswnaf]

Works for what needed to be tested here. However, there are two changes to make:

1. cdh is actually cdh.sh
2. env as a variable needs to be luci.http.getenv.