When building rockylinux images, DIB install the Minimal Install group
which pulls firewalld. By default it allows only SSH traffic, so we
would need specific rules for the management and tenant traffic, but as
we are using security groups, it's safe to remove firewalld.
Change-Id: I87a26faf6c72640d8916bc3452123a9b5a74d39f
e8fd3b7843