acceptance: disabling testing on ubuntu

Testing is very unstable on Ubuntu, packaging is broken and not fixed
for some days, it's blocking our CI.
Let's disable it until it's fixed in UCA.

Change-Id: Ic7d4a06d84cbb0add6e8f08ea967a3dd24f1148d

spec/acceptance/basic_sahara_spec.rb

@@ -27,6 +27,11 @@ describe 'basic sahara' do
         require              => Class['rabbitmq'],
       }
 
+      case $::osfamily {
+        'Debian': {
+          warning('Sahara is not tested on Ubuntu anymore, too unstable for now.')
+        }
+        'RedHat': {
           # Sahara resources
           class { '::sahara::db::mysql':
             password => 'a_big_secret',
@@ -48,6 +53,8 @@ describe 'basic sahara' do
           class { '::sahara::notify':
             enable_notifications => true,
           }
+        }
+      }
       EOS
 
 
@@ -56,9 +63,11 @@ describe 'basic sahara' do
       apply_manifest(pp, :catch_changes => true)
     end
 
+    if os[:family].casecmp('RedHat') == 0
       describe port(8386) do
         it { is_expected.to be_listening.with('tcp') }
       end
+    end
 
   end
 end