Offline related updates

 * Unfify offline content variable
   Collect all data in 'default_local_mirrror_content'
   variable would allow to extend default set in future
   w\o removing|renaming original one
   - add git mirror list
 * Add amphora image for pike|queens
 * debmirror:ubuntu
   - add requirment for dogtag
 * Misc:
   remove duplicate in defaults - linux_system_repo_url
   Fix defaults:openstack:amphora path

Prod-related: PROD-26662 (PROD:26662)
Bug-fix: PROD-26807 (PROD:26807)

Change-Id: I77f0a3648a0a74f70d29ba388e194c51725744f0
diff --git a/defaults/openstack/init.yml b/defaults/openstack/init.yml
index 403173d..1e02297 100644
--- a/defaults/openstack/init.yml
+++ b/defaults/openstack/init.yml
@@ -140,7 +140,7 @@
     octavia_health_manager_node03_address: 192.168.10.12
     #
     amphora_image_name: amphora-x64-haproxy
-    amphora_image_url: "${_param:mcp_binary_registry}/mirantis/openstack/octavia/images/${_param:mcp_version}${_param:openstack_version}/amphora-x64-haproxy.qcow2"
+    amphora_image_url: "${_param:mcp_binary_registry}/mirantis/openstack/octavia/images/${_param:mcp_version}/${_param:openstack_version}/amphora-x64-haproxy.qcow2"
     # HAproxy
     haproxy_openstack_web_bind_port: ${_param:horizon_public_port}
     #