Removed old (unused) devplus.py env for LMS.

This used to be where we enabled some prod-like features on the dev
environment, but it's horribly out of date (it actually predates
the vagrant-based devstack).

lms/envs/devplus.py

-"""
-This config file tries to mimic the production environment more closely than the
-normal dev.py. It assumes you're running a local instance of MySQL 5.1 and that
-you're running memcached. You'll want to use this to test caching and database
-migrations.
-
-Assumptions:
-* MySQL 5.1 (version important?  (askbot breaks on 5.5, but that's gone now))
-
-Dir structure:
-/envroot/
-        /edx-platform # The location of this repo
-        /log  # Where we're going to write log files
-
-"""
-
-# We intentionally define lots of variables that aren't used, and
-# want to import all variables from base settings files
-# pylint: disable=wildcard-import, unused-wildcard-import
-
-from .dev import *
-
-WIKI_ENABLED = True
-
-DATABASES = {
-    'default': {
-        'ENGINE': 'django.db.backends.mysql',
-        'NAME': 'wwc',
-        'USER': 'root',
-        'PASSWORD': '',
-        'HOST': '127.0.0.1',
-        'PORT': '3306',
-        'ATOMIC_REQUESTS': True,
-    },
-    'student_module_history': {
-        'ENGINE': 'django.db.backends.mysql',
-        'NAME': 'student_module_history',
-        'USER': 'root',
-        'PASSWORD': '',
-        'HOST': '127.0.0.1',
-        'PORT': '3306',
-        'ATOMIC_REQUESTS': True,
-    }
-}
-
-CACHES = {
-    'default': {
-        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
-        'LOCATION': '127.0.0.1:11211',
-        'KEY_FUNCTION': 'util.memcache.safe_key',
-    },
-    'general': {
-        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
-        'LOCATION': '127.0.0.1:11211',
-        'KEY_PREFIX': 'general',
-        'VERSION': 5,
-        'KEY_FUNCTION': 'util.memcache.safe_key',
-    }
-}
-
-SESSION_ENGINE = 'django.contrib.sessions.backends.cache'
-
-
-################################ DEBUG TOOLBAR #################################
-INSTALLED_APPS += ('debug_toolbar',)
-MIDDLEWARE_CLASSES += ('debug_toolbar.middleware.DebugToolbarMiddleware',)
-INTERNAL_IPS = ('127.0.0.1',)
-
-DEBUG_TOOLBAR_PANELS = (
-    'debug_toolbar.panels.versions.VersionsPanel',
-    'debug_toolbar.panels.timer.TimerPanel',
-    'debug_toolbar.panels.settings.SettingsPanel',
-    'debug_toolbar.panels.headers.HeadersPanel',
-    'debug_toolbar.panels.request.RequestPanel',
-    'debug_toolbar.panels.sql.SQLPanel',
-    'debug_toolbar.panels.signals.SignalsPanel',
-    'debug_toolbar.panels.logging.LoggingPanel',
-    'debug_toolbar.panels.profiling.ProfilingPanel',
-)
-
-#PIPELINE = True