Remove python-ironicclient from requirements

This commit removes python-ironicclient from requirements because we
don't use it anymore.

Change-Id: Ic1ddc1846ba51e1734865329c32a83d2dac776e8
diff --git a/requirements.txt b/requirements.txt
index f6e30ce..17c2968 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -15,7 +15,6 @@
 python-neutronclient>=2.3.11,<3
 python-cinderclient>=1.1.0
 python-heatclient>=0.3.0
-python-ironicclient>=0.2.1
 python-saharaclient>=0.7.6
 python-swiftclient>=2.2.0
 testrepository>=0.0.18