ensure site.yml.sample always gathers facts and installs python2

Then avoids an issue where if you're using tags to run the playbook then
no facts are gathered, resulting in subsequent tasks failing that depend
on them.

Signed-off-by: Andrew Schoen <aschoen@redhat.com>

site.yml.sample

@@ -13,6 +13,8 @@
   - clients
   - iscsigws
   gather_facts: false
+  tags:
+    - always
   tasks:
     # If we can't get python2 installed before any module is used we will fail
     # so just try what we can to get it installed