Add Elasticsearch 6 support

Remove predefined version from formula
Start using states instead of modules in client.sls
Update test repos to mirror.mirantis.com
Update tests to use ES6
Disable all x-pack features

Change-Id: I7f5a65b0777f2ebce9bd3aae79888d2b00d428b6
Prod-Related: PROD-25122
diff --git a/tests/pillar/curator.sls b/tests/pillar/curator.sls
index 7425a81..09c2be7 100644
--- a/tests/pillar/curator.sls
+++ b/tests/pillar/curator.sls
@@ -4,7 +4,7 @@
     bind:
       address: 0.0.0.0
       port: 9200
-    version: 2
+    version: 5
     curator:
       timeout: 900
       logfile: /var/log/elasticsearch/curator.log
@@ -70,4 +70,4 @@
               source: creation_date
               direction: older
               unit: days
-              unit_count: 2
\ No newline at end of file
+              unit_count: 2