Corrected Python runtime for neutron-lbaas-dashboard

- poise does things in Strange Ways. it works better for package-based
  applications when it's not constrained

Change-Id: I311bccb06f8a3b89dd29a78ca259ab85cfe23d3c

recipes/neutron-lbaas-dashboard.rb

@@ -20,9 +20,8 @@ include_recipe 'openstack-dashboard::horizon'
 django_path = node['openstack']['dashboard']['django_path']
 
 # use system python for lbaasv2 dashboard
-python_runtime 'neutron-lbaas-dashboard' do
+python_runtime '2' do
   provider :system
-  version '2.7'
 end
 
 python_package 'neutron-lbaas-dashboard' do

spec/neutron-lbaas-dashboard_spec.rb

@@ -17,7 +17,7 @@ describe 'openstack-dashboard::neutron-lbaas-dashboard' do
     end
 
     it do
-      expect(chef_run).to install_python_runtime('neutron-lbaas-dashboard')
+      expect(chef_run).to install_python_runtime('2')
     end
 
     it do