Hosting Features submit should trigger drush cache clear after verify.

I was running into problems with fix-permissions scripts. It is throwing warnings about a missing argument (which is there, but... for another issue).

I decided to turn off fix_permissions and fix_ownership, to deal with it later, but hostmaster verify would still fire a warning, clearly still running the drush code for those modules. This continued to happen no matter how many times I verified hostmaster, until I ran a drush cache clear.

This seems serious... as a user I thought I disabled a hosting feature, but then it kept running.