Allow to not manage Tempest code in Puppet

In the case you are using a package, you may want the flexibility to not
use VCS to manage Tempest code and just use the Puppet module to
configure Tempest itself.

Adding a new parameter, true by default to keep backward compatibility.

Change-Id: I6d5c17393630fda156bebc55fe28f97bcabecca4

manifests/init.pp

@@ -6,6 +6,9 @@
 # managed in tempest.conf.
 #
 class tempest(
+  $install_from_source       = true,
+  $tempest_config_file       = '/var/lib/tempest/etc/tempest.conf',
+
   # Clone config
   #
   $tempest_repo_uri          = 'git://github.com/openstack/tempest.git',
@@ -72,6 +75,7 @@ class tempest(
 
   include 'tempest::params'
 
+  if $install_from_source {
     ensure_packages([
       'git',
       'python-setuptools',
@@ -127,6 +131,11 @@ class tempest(
       path    => $tempest_conf,
       require => File[$tempest_conf],
     }
+  } else {
+    Tempest_config {
+      path => $tempest_config_file,
+    }
+  }
 
   tempest_config {
     'compute/change_password_available': value => $change_password_available;