Switch to fedora-29 for fedora-latest nodeset

F28 is EOL as of 5.29.19, so change to use fedora-29
and remove it from stack.sh.

Depends-on: https://review.opendev.org/#/c/662538/
Change-Id: I5ebdb68fcd01a1e63be4b3c0735a274783aad818

Author: Brian Haley

.zuul.yaml

@@ -52,7 +52,7 @@
     name: devstack-single-node-fedora-latest
     nodes:
       - name: controller
-        label: fedora-28
+        label: fedora-29
     groups:
       - name: tempest
         nodes:

stack.sh

@@ -224,7 +224,7 @@ write_devstack_version
 
 # Warn users who aren't on an explicitly supported distro, but allow them to
 # override check and attempt installation with ``FORCE=yes ./stack``
-if [[ ! ${DISTRO} =~ (xenial|artful|bionic|stretch|jessie|f28|f29|opensuse-15.0|opensuse-15.1|opensuse-tumbleweed|rhel7) ]]; then
+if [[ ! ${DISTRO} =~ (xenial|artful|bionic|stretch|jessie|f29|opensuse-15.0|opensuse-15.1|opensuse-tumbleweed|rhel7) ]]; then
     echo "WARNING: this script has not been tested on $DISTRO"
     if [[ "$FORCE" != "yes" ]]; then
         die $LINENO "If you wish to run this script anyway run with FORCE=yes"