Add python-ironicclient to Nova image (#1190)

diff --git a/images/nova/Dockerfile b/images/nova/Dockerfile
index 2641a7a..ec69e92 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