qa: set mds config with `config set` for a particular test
Reviewed-by: Xiubo Li <xiubli@redhat.com> Reviewed-by: Patrick Donnelly <pdonnell@redhat.com> Reviewed-by: Dhairya Parmar <dparmar@redhat.com> Reviewed-by: Jos Collin <jcollin@redhat.com> Reviewed-by: Rishabh Dave <ridave@redhat.com>