Update usernames & passwords

Updated defaults

changed U to You and added a "the" where needed

Rename targets to devices in the legal keys test. Use utils.iter_modules instead of interpreter internals to load module tests. Flatten the load_tests code to use fewer language features/utilities. Grab module metadata in the same way the interpreter was doing it, but locally in the test case.

Add exploits ZTE F660 Config Disclosure & ZTE F6XX Default root password

s/env python/env python2/

In several distributions, e.g. archlinux,
'python' means python3, which throws InvalidSyntax