Merge "Bump python-novaclient version"

Author: Zuul

requirements.txt

@@ -14,6 +14,6 @@ osc-lib>=2.3.0 # Apache-2.0
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 python-keystoneclient>=3.22.0 # Apache-2.0
-python-novaclient>=17.0.0 # Apache-2.0
+python-novaclient>=18.1.0 # Apache-2.0
 python-cinderclient>=3.3.0 # Apache-2.0
 stevedore>=2.0.1 # Apache-2.0