Streamline nexus role tests by using smaller test images

A 140mb haproxy image was substituted with tiny alpine
image to make CI tests faster.

Change-Id: Ic1a234df8f293e12a6e864817a19bf5445f10fe9
Issue-ID: OOM-1942
Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>
diff --git a/ansible/test/play-infrastructure/molecule/default/vars.yml b/ansible/test/play-infrastructure/molecule/default/vars.yml
index 6ca5a1a..8aa774b 100644
--- a/ansible/test/play-infrastructure/molecule/default/vars.yml
+++ b/ansible/test/play-infrastructure/molecule/default/vars.yml
@@ -18,7 +18,7 @@
     registry: "{{ molecule_test_registry }}"
     path: "/busybox"
     tag: "latest"
-  aaionap-haproxy:
+  alpine:
     registry: "{{ molecule_test_registry }}"
-    path: "/aaionap/haproxy"
-    tag: "1.2.4"
+    path: "/library/alpine"
+    tag: "latest"
diff --git a/ansible/test/roles/prepare-nexus/defaults/main.yml b/ansible/test/roles/prepare-nexus/defaults/main.yml
index be6bd52..4e76f60 100644
--- a/ansible/test/roles/prepare-nexus/defaults/main.yml
+++ b/ansible/test/roles/prepare-nexus/defaults/main.yml
@@ -7,7 +7,6 @@
     tag: latest
     archive_path: /tmp/busybox.tar
     dest: "{{ aux_data_path }}/busybox.tar"
-  - name: nexus3.onap.org:10001/aaionap/haproxy
-    tag: 1.2.4
-    archive_path: /tmp/haproxy.tar
-    dest: "{{ aux_data_path }}/aaionap-haproxy.tar"
+  - name: nexus3.onap.org:10001/library/alpine
+    archive_path: /tmp/alpine.tar
+    dest: "{{ aux_data_path }}/alpine.tar"