tests: switch to Python 3 for Red Hat systems using dnf

Author: duck-rh

molecule/_resources/group_vars/all/common.yml

@@ -20,7 +20,7 @@ platform_base:
 # TODO: btw why is there no dnf update while there's an equivalent in all other distros?
 image_setup: |
     if [ $(command -v apt-get) ]; then apt-get update && apt-get upgrade -y && apt-get install -y systemd-sysv python sudo bash ca-certificates && apt-get clean; \
-    elif [ $(command -v dnf) ]; then dnf makecache && dnf --assumeyes install python sudo python-devel python2-dnf bash && dnf clean all; \
+    elif [ $(command -v dnf) ]; then dnf makecache && dnf --assumeyes install python3 sudo python3-devel python3-dnf bash && dnf clean all; \
     elif [ $(command -v yum) ]; then yum makecache fast && yum install -y python sudo yum-plugin-ovl bash && sed -i 's/plugins=0/plugins=1/g' /etc/yum.conf && yum clean all; \
     elif [ $(command -v zypper) ]; then zypper refresh && zypper update -y && zypper install -y python sudo bash python-xml && zypper clean -a; \
     elif [ $(command -v apk) ]; then apk update && apk add --no-cache python sudo bash ca-certificates; fi