Add bool to use_upstream_docker conditional

This is an ansible behavior change that's coming in 2.12 but is
currently spewing warnings. The warnings make the log really hard
to read, so just fix it.

Disable group name auto-renaming

If you have group names with non-python identifier characters, it
prevents you from looking it up in jinja like "groups.group-name"
so ansible auto-transforms it so you can do "groups.group_name".
This is a confusing behavior which is going away. However, ansible
is warning everyone who has groups with characters in them as it
has no idea how you might be accessing those group names. Add
a config setting to suppress the warning about -'s in group names.

Change-Id: Ib3262025799af7c3171ed0b079cb1dd969075931