Create new analytics_exporter.py settings

These new settings files are intended to be used by the Analytics
Exporter automation managed by the DE team.  The Analytics Exporter must
be able to simply clone edx-platform, install requirements, fetch
remote-config, then just run management commands without needing to run
any ansible or pull down any docker/AMI images.  Since the theming app
includes a check that fails if the themes base dir cannot be found, and
that check runs on app startup, we must disable the app.

DENG-379

cms/envs/analytics_exporter.py

+"""
+Settings for running management commands for the Analytics Exporter.
+
+The Analytics Exporter jobs run edxapp management commands using production
+settings and configuration, however they currently DO NOT use edxapp production
+environments (such as edxapp Amazon AMIs or Docker images) where theme files
+get installed.  As a result we must disable comprehensive theming or else
+startup checks from the theming app will throw an error due to missing themes.
+"""
+
+from .production import *  # pylint: disable=wildcard-import, unused-wildcard-import
+
+ENABLE_COMPREHENSIVE_THEMING = False

lms/envs/analytics_exporter.py

+"""
+Settings for running management commands for the Analytics Exporter.
+
+The Analytics Exporter jobs run edxapp management commands using production
+settings and configuration, however they currently DO NOT use edxapp production
+environments (such as edxapp Amazon AMIs or Docker images) where theme files
+get installed.  As a result we must disable comprehensive theming or else
+startup checks from the theming app will throw an error due to missing themes.
+"""
+
+from .production import *  # pylint: disable=wildcard-import, unused-wildcard-import
+
+ENABLE_COMPREHENSIVE_THEMING = False