Store login session in database to allow replication of web profile

[innovate-invent]

Describe your idea for a new feature

Replication of the 'web' profile is currently not possible given that the login session is stored in memory rather than the database.

Describe how you would access this feature?

Store the user session in a way that allows the state to be shared among replicates of the server instance running the web profile.

Additional information

https://phac-nml.github.io/irida-documentation/administrator/web/#multi-web-server-configuration