Clean yum after usage

Author: tomclark0

etc/kayobe/kolla.yml

@@ -418,7 +418,8 @@ kolla_build_blocks:
     {% if base_package_type == 'rpm' %}
     ADD plugins-archive /
     python3 -m pip --no-cache-dir install /plugins/* \
-    && dnf install python3-libvirt python3-ethtool
+    && dnf install python3-libvirt python3-ethtool -y \
+    && dnf clean all
     {% endif %}
     {% endraw %}
     {% endif %}
@@ -439,7 +440,8 @@ kolla_build_blocks:
     {% if base_package_type == 'rpm' %}
     ADD plugins-archive /
     python3 -m pip --no-cache-dir install /plugins/* \
-    && dnf install python3-libvirt python3-ethtool
+    && dnf install python3-libvirt python3-ethtool -y \
+    && dnf clean all
     {% endif %}
     {% endraw %}
     {% endif %}