Only clone tempest with depth of 1

For automation, there's usually no need to clone the entire
revision history.

Change-Id: I766fc0ef100376578daac985cb7a85a9a07dd6ed
Closes-Bug: #1455240

recipes/setup.rb

@@ -90,7 +90,7 @@ end
 git '/opt/tempest' do
   repository 'https://github.com/openstack/tempest'
   reference   'master'
-
+  depth 1
   action :sync
 end
 

spec/setup_spec.rb

@@ -121,7 +121,8 @@ describe 'openstack-integration-test::setup' do
         '/opt/tempest'
       ).with(
         repository: 'https://github.com/openstack/tempest',
-        reference: 'master'
+        reference: 'master',
+        depth: 1
       )
     end