Add auto configs to HDP plugin

Add ability to automaticaly generate better configurations for
cluster. All calculations of recommended config values is executed
by Ambari itself according to 'ALWAYS_APPLY' strategy.

Change-Id: I98f14e4578397d6a8d14438e368485d5dbeaeed2

releasenotes/notes/auto_configs_for_hdp-011d460d37dcdf02.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Add ability to automaticaly generate better configurations for
+    Ambari cluster by using 'ALWAYS_APPLY' strategy

sahara/plugins/ambari/deploy.py

@@ -335,6 +335,10 @@ def _build_ambari_cluster_template(cluster):
         "default_password": uuidutils.generate_uuid(),
         "host_groups": []
     }
+
+    if cluster.use_autoconfig:
+        cl_tmpl["config_recommendation_strategy"] = "ALWAYS_APPLY"
+
     if kerberos.is_kerberos_security_enabled(cluster):
         cl_tmpl["credentials"] = _get_credentials(cluster)
         cl_tmpl["security"] = {"type": "KERBEROS"}