Prepare for post-Pike updates

Prepare the metadata for a post-Pike release.

Change-Id: I89e6f3de09047b355c68370e7dc6fa55216cd209

metadata.json

@@ -93,5 +93,5 @@
     ],
     "source": "git://github.com/openstack/puppet-nova.git",
     "summary": "Puppet module for OpenStack Nova",
-    "version": "11.4.0"
+    "version": "11.5.1"
 }

releasenotes/source/conf.py

@@ -53,9 +53,9 @@ copyright = u'2017, Puppet OpenStack Developers'
 # built documents.
 #
 # The short X.Y version.
-version = '11.4.0'
+version = ''
 # The full version, including alpha/beta/rc tags.
-release = '11.4.0'
+release = ''
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.