Skip post_installation in case of installer failure (#84)

Signed-off-by: Jakub Stejskal <[email protected]>

Author: Frawless

Diff for: osia/installer/executor.py

@@ -73,7 +73,8 @@ def install_cluster(cloud_provider,
         logging.error(exception)
         if inst.check_clean():
             delete_cluster(cluster_name, installer)
-            return
+        # Do not continue in case of installer failure
+        return
 
     inst.post_installation()