CIDM-1566 - Add via-header to container config

[scarlettmoonbell]

With the new behavior surrounding the via, via-header and repose-version options in container config. We found we were leaking the repose version. This updates the puppet module so we can control the via header and repose version in the user response.

[adrianjgeorge]

These changes don't really reflect how this option changed. You can find more details here: http://www.openrepose.org/versions/8.10.0.0/architecture/container.html#via-header-configuration
Sadly, we have failed to provide an example there, but you can find one here: https://github.com/rackerlabs/repose/blob/master/repose-aggregator/tests/functional-tests/src/integrationTest/configs/features/core/via/element/container.cfg.xml
I'd probably also add a check to make sure that via and the new options aren't ever trying to be used simultaneously, because that will fail within repose.

[scarlettmoonbell]

@adrianjgeorge All of your comments should be addressed in this amended commit.

• error thrown if both via and via-header are set
• variable in depreciated section removed
• via-header properly set as it's own element in container.cfg.xml

[adrianjgeorge]

I don't see any deal breakers here.

[scarlettmoonbell]

@adrianjgeorge The two issues you mentioned have been resolved in the amended commit. Thanks for the catches.

[adrianjgeorge]

Looks good to me.