Corrects SELinux enablement, lbaasv2 dashboard installation

- corrects SELinux enablement on RHEL platform families.
- switches lbaasv2 dashboard to use system Python, so that it gets
  picked up correctly.

Change-Id: I8b10381b169e8dd56c9cee990f1e3c7d3283d1b0

recipes/apache2-server.rb

@@ -194,7 +194,7 @@ apache_site 'openstack-dashboard' do
 end
 
 execute 'restore-selinux-context' do
-  command 'restorecon -Rv /etc/httpd /etc/pki; chcon -R -t httpd_sys_content_t /usr/share/openstack-dashboard || :'
+  command 'restorecon -Rv /etc/httpd /etc/pki; chcon -R -t httpd_sys_content_t /usr/share/openstack-dashboard /var/www/html || :'
   action :nothing
   only_if { platform_family?('fedora') }
 end

recipes/horizon.rb

@@ -115,7 +115,7 @@ package 'openstack-dashboard-ubuntu-theme' do
 end
 
 # resource can be triggered from other recipes (e.g. in
-# recipe/neutron-lbaas-dashboard.rb)
+# recipes/neutron-lbaas-dashboard.rb)
 execute 'openstack-dashboard collectstatic' do
   cwd django_path
   environment 'PYTHONPATH' => "/etc/openstack-dashboard:#{django_path}:$PYTHONPATH"

recipes/neutron-lbaas-dashboard.rb

@@ -17,12 +17,17 @@
 
 include_recipe 'openstack-dashboard::horizon'
 
-python_runtime '2'
-
 django_path = node['openstack']['dashboard']['django_path']
 
+# use system python for lbaasv2 dashboard
+python_runtime 'neutron-lbaas-dashboard' do
+  provider :system
+  version '2.7'
+end
+
 python_package 'neutron-lbaas-dashboard' do
   version node['openstack']['dashboard']['lbaas']['version']
+  notifies :run, 'execute[restore-selinux-context]', :immediately
   notifies :run, 'execute[openstack-dashboard collectstatic]'
 end
 

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('2')
+      expect(chef_run).to install_python_runtime('neutron-lbaas-dashboard')
     end
 
     it do