Following this issue description #28511 (comment), should we change the words slave and master used in Symfony code?

Here are 3 files where we find such words:

• https://github.com/symfony/symfony/blob/master/src/Symfony/Component/VarDumper/Caster/RedisCaster.php
• https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Cache/Traits/RedisTrait.php
• https://github.com/symfony/symfony/blob/master/src/Symfony/Component/OptionsResolver/Tests/OptionsResolverTest.php

@javiereguiluz's suggestion for primary/replica seems to fit.

For Redis related code, we used their wording, so changing it might also confuse some users.