Feature/ubuntu 20

Created by: mira13

Description

The changes performed to make ensembl tests compatable with Ubuntu 20, Mysql 8

Use case

SOme test are failing for Ubuntu_20 and mysql8, so it'a fix for them

Benefits

It's a step towards new system

Possible Drawbacks

Not observed

Testing

Have you added/modified unit tests to test the changes?

Yes, they pass with new ensembl-test repository changes

Have you run the entire test suite and no regression was detected?

yes