Rework the init files and configs

1. Add hhvm-fastcgi.hdf with some config parameters for running hhvm in fastcgi move
2. Rework hhvm.fastcgi init to not use the defaults/hhvm-fastcgi file, since you have it all in the hdf anyway
3. Fix indentation in hhvm-fastcgi init file
4. Rename server.hdf to hhvm.hdf to better indicate it belongs to the hhvm init
5. Reapply appropriate chmods, because sublime hates me, and sets it to 644

Overall, a bit easier to work with, even if the PR looks garbled :(

Hopefully @dol is ok with me reworking his init