Added 401 to expected status codes on health check. 

This will allow for Basic Auth applications to work in scaled mode.

https://bugzilla.redhat.com/show_bug.cgi?id=1145810

Somehow I missed this during the review (seems like I'm getting old...) this should be:

```
    option httpchk GET <%= ENV['HAPROXY_CARTRIDGE_HTTPCHK_URI'] || "/" %>
    http-check expect rstatus <%= ENV['HAPROXY_CARTRIDGE_HTTPCHK_EXPECT_RSTATUS'] || "2..|3..|401" %>
```