New task "bosh-extend-runtime-config" for fixing BOSH Lite config

[jochenehret]

• new task can patch a BOSH runtime config, similar to bosh-extend-cloud-config
• note that the config name must be explicitly specified (e.g. "dns")
• use task in BOSH Lite setup to patch DNS config for Noble/Warden stemcell

[iaftab-alam]

Hey Jochen, quick question, we had conversation with Nayden last week and he mentioned that we dnt need this patch via ops file for warden and this PR should work: cloudfoundry/bosh-dns-release#156!

[jochenehret]

Nayden responded today:

We looked into the DNS issue further. It looks like we won't be able to use the Warden stemcell without using bosh-dns for external resolving, like we do for all other Noble. From my testing, I found that there is no NIC and this in return blocks the DNS address assignment.
I think the initial suggestion for an ops file is the way to go. Can you please check if it works with the ops file changes from here?
cloudfoundry/bosh-deployment#512

So the fix in bosh-dns-release is not sufficient.

[iaftab-alam]

Alright That makes sense! Thank you! I think we can merge it