Add a way to override some clock properties

[sandhose]

I have a deployment that takes a lot of time to stage, and it never gets to the end because of the pending_builds.expiration_in_seconds which is set to 42. I ended up tweaking this property "live" in my cluster and managed to make the build work, but now I'm trying to change this value in my manifests via ytt, but I can't find a sane way to do this.

The properties I would like to override are here:

capi-k8s-release/config/ccng-config.lib.yml

Lines 306 to 311 in 1cab1d5

	pending_builds:
	frequency_in_seconds: 300
	expiration_in_seconds: 42
	pending_droplets:
	frequency_in_seconds: 300
	expiration_in_seconds: 42

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/179716203

The labels on this github issue will be updated when the story is started.

[bosh-admin-bot]

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