Merge pull request #362 from code-dot-org/test

[11/06/2014] DTP
Stop varnish before building dashboard and pegasus on front-ends for better fail-over in the load balancer, better reporting when upgrading varnish only instances, daemon is fully chef'd
Work-around for chef issue, don't fail if varnish isn't in proper state at start.
Merge branch 'test' of github.com:code-dot-org/code-dot-org into staging