tests: improve scenario initialization

fix

    Odd number of elements in anonymous hash at /thruk/script/../lib/Thruk/Utils/Cluster.pm line 326

when there is no secret yet,

lib/Thruk/Utils/Cluster.pm

@@ -316,6 +316,7 @@ sub run_cluster {
 
     # run function on each cluster node
     my $res = [];
+    my $secret_key = Thruk::Config::secret_key();
     for my $n (@nodeids) {
         next unless $self->{'nodes_by_id'}->{$n};
         next if($type eq 'others' && $self->is_it_me($n));
@@ -324,7 +325,7 @@ sub run_cluster {
         my $http = Thruk::Backend::Provider::HTTP->new({
                             options => {
                                 peer => $node->{'node_url'},
-                                auth => Thruk::Config::secret_key(),
+                                auth => $secret_key,
                             },
                         }, $c->config);
         my $t1   = [gettimeofday];

t/scenarios/cluster_e2e/thruk/playbook.yml

@@ -13,6 +13,14 @@
       stdin: |
         APACHE_MODE=own
   - shell: rm /omd/sites/demo/etc/naemon/conf.d/*.cfg
+  - name: "create secret.key"
+    shell: echo "testkey" > /omd/sites/demo/var/thruk/secret.key
+  - name: "set permissions on secret.key"
+    file:
+      path: /omd/sites/demo/var/thruk/secret.key
+      mode: 0600
+      owner: demo
+      group: demo
   - shell: ln -sfn /thruk/support/thruk_templates.cfg /omd/sites/demo/etc/naemon/conf.d/thruk_templates.cfg
   - shell: "rsync -avu /omd/sites/demo/{{item}}/thruk/. /mnt/{{item}}/. ; rm -rf /omd/sites/demo/{{item}}/thruk ; ln -sfn /mnt/{{item}} /omd/sites/demo/{{item}}/thruk; chown demo: /mnt/{{item}}/."
     with_items: ['etc', 'var']