nova_flavor: Strip '' from project id value

Currently the project field shows a list of projects like;

project=['ec085e18-22bb-403b-8ba5-0f9c6d67dffa']

The commit 86764de9cd added the logic to
handle this format but it missed surrounding quote(') which should be
also removed.

Change-Id: If65221db5a9e60e797b834a305d385d3fea4db16

lib/puppet/provider/nova_flavor/openstack.rb

@@ -101,6 +101,7 @@ Puppet::Type.type(:nova_flavor).provide(
       else
         project_value = access_project_ids
       end
+      project_value = project_value.gsub('\'', '')
       properties = Hash[attrs[:properties].scan(/(\S+)='([^']*)'/)] rescue nil
       new(
           :ensure      => :present,