Fix rockylinux and make it voting

Some rockylinux deployments have the curl-minimal package installed by
default (the latest GenericCloud image still has the curl package), it
triggers an error when devstack wants to install the curl package.
Fix this issue by swaping curl-minimal with curl before installing base
packages.

Change-Id: I969e8dc22e7d11c9917a843d9245f33a04fe197d

Author: gthiemonge

.zuul.yaml

@@ -726,7 +726,6 @@
     description: Rocky Linux 9 Blue Onyx platform test
     nodeset: devstack-single-node-rockylinux-9
     timeout: 9000
-    voting: false
     vars:
       configure_swap_size: 4096
 

stack.sh

@@ -394,6 +394,13 @@ elif [[ $DISTRO == "rhel9" ]]; then
     sudo dnf config-manager --set-enabled crb
     # rabbitmq and other packages are provided by RDO repositories.
     _install_rdo
+
+    # Some distributions (Rocky Linux 9) provide curl-minimal instead of curl,
+    # it triggers a conflict when devstack wants to install "curl".
+    # Swap curl-minimal with curl.
+    if is_package_installed curl-minimal; then
+        sudo dnf swap -y curl-minimal curl
+    fi
 elif [[ $DISTRO == "openEuler-22.03" ]]; then
     # There are some problem in openEuler. We should fix it first. Some required
     # package/action runs before fixup script. So we can't fix there.