Add prepare-nexus role

This role can be used by nexus role/infra playbook tests.
It downloads and archives the nexus image used by these tests.
It also archives some example docker images that
can be used to test runtime image pushing.

Change-Id: I027dd5dda60ab0abba7701cb038f6552a72e3599
Issue-ID: OOM-1816
Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>
Signed-off-by: Michal Zegan <m.zegan@samsung.com>
diff --git a/ansible/test/roles/prepare-nexus/vars/main.yml b/ansible/test/roles/prepare-nexus/vars/main.yml
new file mode 100644
index 0000000..d2ee354
--- /dev/null
+++ b/ansible/test/roles/prepare-nexus/vars/main.yml
@@ -0,0 +1,5 @@
+---
+# Hosts to be added to /etc/hosts file.
+etc_hosts:
+  - nexus.infrastructure-server
+  - nexus3.onap.org