[stable/zed] Add python-ironicclient to Nova image (#1220)

This is an automated cherry-pick of #1190
/assign mnaser
diff --git a/images/nova/Dockerfile b/images/nova/Dockerfile
index 6921c3a..5d5ddee 100644
--- a/images/nova/Dockerfile
+++ b/images/nova/Dockerfile
@@ -22,6 +22,7 @@
 pip3 install \
     --constraint /upper-constraints.txt \
         /src/nova \
+        python-ironicclient \
         storpool \
         storpool.spopenstack
 EOF