CORD-993
elasticstack role, installs on head node
fix elasticstack/java apt-cacher passthrough
reliability fix for download Glance VM images
more reliable reliability fix
simplify apt-cacher ssl passthrough
apt-cacher defaults in other roles

Change-Id: Ia78d256f562c30539240d12ba163f7af6e375131
diff --git a/roles/elasticstack/files/elastic.asc b/roles/elasticstack/files/elastic.asc
new file mode 100644
index 0000000..d6c2bb3
--- /dev/null
+++ b/roles/elasticstack/files/elastic.asc
@@ -0,0 +1,32 @@
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