The ORA machinery gets gummed up when it gets very large submissions and
throws a lot of 500s.

Co-Authored-By: Jason Bau <jbau@stanford.edu>

Sets up a pypy mirror caching server

removing nginx setup from individual roles

it was not called for

* Set postrotate script to SIGHUP nginx after rotation
* Explicitly set permissions on freshly created logfiles

Creates edxapp upstart job and combines lms, lms-preview. cms
into the edxapp role.

* sends logs to /mnt/logs/nginx instead of /var/log. Note that on fresh
  server startup, nginx will still log to /var/log until it reads its
  configuration.
* Installs logrotate configuration for freshly moved nginx logs
* Some directory and file permissions fixups
* Improved order of operations on nginx installation/bringup

* Bugfix to rsyslog configuration; configuration file had missing
  extension
* Logrotate recipes for edx log files
* Files reorganized, renamed

* Rename auth_config and env_config to be specific to LMS and CMS
* Minor CMS configuration cleanups elsewhere

* Needs more work, but seems to have many of the basics.