RUN required pip installs

Author: tomclark0

etc/kayobe/kolla.yml

@@ -428,7 +428,7 @@ kolla_build_blocks:
     {% raw %}
     {% if base_package_type == 'rpm' %}
     ADD plugins-archive /
-    python3 -m pip --no-cache-dir install /plugins/* \
+    RUN python3 -m pip --no-cache-dir install /plugins/* \
     && dnf install python3-libvirt python3-ethtool -y \
     && dnf clean all
     {% endif %}
@@ -450,7 +450,7 @@ kolla_build_blocks:
     {% raw %}
     {% if base_package_type == 'rpm' %}
     ADD plugins-archive /
-    python3 -m pip --no-cache-dir install /plugins/* \
+    RUN python3 -m pip --no-cache-dir install /plugins/* \
     && dnf install python3-libvirt python3-ethtool -y \
     && dnf clean all
     {% endif %}