use beanstalkd along with aurora for job queue

[jachym]

Description

For the job queue, we are using sqlite/postgres database. But there are dedicated tools for creating job queues, like Beanstalkd

https://beanstalkd.github.io/

Idea is, there is a server running on certain port, and applications (instances of PyWPS) are asking for tasks

[cehbrecht]

@jachym do you have links to these tools?