Add support for mariadb's auth_ed25519
Add support for mariadb's auth_ed25519

This patch updates python-PyMySQL and python-pynacl to include patches
required to add support for auth_ed25519 in mariadb access [1] [2].

[1] https://github.com/rdo-common/python-PyMySQL/commit/31de31abec41d308ac6c73dda2b5ebfcb28fe8c2
[2] https://github.com/rdo-common/python-pynacl/commit/416364b3931c51af16824e9700bd7c5328d58e5a

Related-Bug: rhbz#1687309

Depends-On: https://review.rdoproject.org/r/#/c/26282/
Change-Id: I26572af1fde716fa5bb2f8af0c9d02c08540b065

redhat-openstack/rdoinfo