Session improvements [PD-418]

- Remove ms_session and mj_session in favor of session
- Remove signals from seo/signals.py
Reduce factory boy debug logs to preserve sanity
This signal was created in 2012 and hasn't been used since.
Removed unused signal connection. top level directory shouldn't be a Python package.
minor formatting to get rid of a few more pylint warnings.
secondary emails enabled by default.
Merge pull request #830 from DirectEmployers/session-table

Session improvements [PD-418]
Merge branch 'merge' into multiple-locations
Merge pull request #833 from DirectEmployers/secondary-email

[PD-444] secondary emails enabled by default.
Updated celery routes and tasks to use correct queues and recommended syntax [PD-451]
Fixed tests
Merge pull request #832 from DirectEmployers/yagni

This signal was created in 2012 and hasn't been used since.
Merge branch 'merge' into multiple-locations
Merge pull request #836 from DirectEmployers/celery-updates

Updated celery routes and tasks to use correct queues and recommended syntax [PD-451]
Fix removing of locations
Merge branch 'merge' into multiple-locations
Add required indicator for locations