Fix nginx access log format

Change-Id: Ib01eb9db22fc67f709ef63488429f757a87730d9
Update hhvm configuration

Get rid of hdf file and some increased resource limits taken
from I455c0e9f1746ba9.

Remove access log rules, were not working anyway and not needed
since nginx is proxying hhvm.

Change-Id: I49840b9821f8d8ddea4aee89b0b30096d4130080