Remove PE requirement from metadata.json

The PE requirement in metadata.json is not
supported anymore and puppet-lint will throw:

The 'pe' requirement is no longer supported by the Forge.

Change-Id: I1c9f7b5d3a8cb7c501c4df5f02a9b4b0866c2826

metadata.json

@@ -55,10 +55,6 @@
     ],
     "project_page": "https://launchpad.net/puppet-cloudkitty",
     "requirements": [
-        {
-            "name": "pe",
-            "version_requirement": "4.x"
-        },
         {
             "name": "puppet",
             "version_requirement": "4.x"
@@ -67,4 +63,4 @@
     "source": "git://github.com/openstack/puppet-cloudkitty.git",
     "summary": "Puppet module for OpenStack cloudkitty",
     "version": "2.3.0"
-}
+}