fix module loading undefined error

[chrisnojima]

@keybase/react-hackers
So we've been bitten by this error once before, its really a problem with the metro bundler (facebook/metro#152) where if you import a file multiple times it can freak out. In this case we already were importing config-gen (https://github.com/keybase/client/blob/master/shared/actions/teams.js#L25) but then we added another import of config-gen and didn't clean up the second one (https://github.com/keybase/client/blob/master/shared/actions/teams.js#L17). This is kind of annoying and hard to debug or notice.

I think a best practice for us would be to

1. Don't ever add .js to imports (also causes this problem)
2. When importing the -gen/constants/types files always use import *
3. When adding an import see if its already imported

Updated RN will fix this issue but we're not there yet.
Also we might to relook at a imports sorting eslint plugin again. Ideally it'd sort by file name maybe so its more obvious when this happens and would keep the order stable as we pull more things in (vs sorting based on the contents of the import line)