Enablement for oci-phase-1 configuration in CC

[BooleanCat]

Change rootfs column size to 1024. Diego's desired_lrp table, column roofs has width 255, which is too short to fit an OCI URI that looks like:

preloaded+layer:cflinuxfs2?layer=https://cloud-controller-ng.service.cf.internal:9023/internal/v4/droplets/3f53478e-d606-4380-a248-1b64ec930edd/753660e34a49c5985dd544ab184a990c1d27d3a996a13220c8a3bc8c9393e191/download&layer_path=/home/vcap&layer_digest=753660e34a49c5985dd544ab184a990c1d27d3a996a13220c8a3bc8c9393e191

[#149234807]

Tracker: https://www.pivotaltracker.com/story/show/149234807

Signed-off-by: Tom Godkin tgodkin@pivotal.io
Signed-off-by: Ed King eking@pivotal.io
Signed-off-by: Craig Furman cfurman@pivotal.io

[cfdreddbot]

Hey BooleanCat!

Thanks for submitting this pull request! I'm here to inform the recipients of the pull request that you and the commit authors have already signed the CLA.

[cf-gitbot]

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

https://www.pivotaltracker.com/story/show/150165898

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

[emalm]

Thanks, @BooleanCat! Is there any other work you have in mind that would necessitate an even larger size to the rootfs column? I see that that URL is 317 characters in total, so the URLs of this form would fit into that new 1024 comfortably.

Best,
Eric

[BooleanCat]

We are still building out oci compatibility within garden/grootfs and there's a possibility that we might need to put more stuff in this URL later as we learn more.

A size of 1024 somewhat future proofs us against that possibility.

[emalm]

Merged via 7699bb2.