modules living inside scanner should include the Scanner mixin

As @hmoore-r7 noticed, there are some modules living in ```modules/auxiliary/scanner/``` which doesn't include the ```Scanner``` mixin. This pull request tries to solve it. There are some exceptions / modules this pull request is forgetting:

modules/auxiliary/scanner/http/enum_wayback.rb: because it doesn't use RHOSTS neither RHOST at all, probably it shouldn't live in the ```scanner``` folder?
modules/auxiliary/scanner/http/crawler.rb: because I guess it is designed as a web crawler/**scanner**, because of that it's living under ```scanner```
modules/auxiliary/scanner/http/smt_ipmi_cgi_scanner.rb: because @hmoore-r7 is taking care of it.

Verification
----------

- [ ] Run msftidy against the modules. Verify there aren't warnings.
- [ ] Get and install vulnerable applications for testing || be confident about your code review skill || or put a dummy web server just to verify the modules are running as before  for verification