Appending as the only insertion method for arrays is too limiting

[anEXPer]

We currently use an append to the instance_groups array in our bosh manifest to add an optional instance group. However, we discovered that we need this instance group to come up not-last. Since bosh deploys instance groups, broadly, in order, appending isn't an appropriate insertion method for jobs that need to come up before other jobs.

We'd be happy to insert before or after a given name, or even at an index number of the array.

[drnic]

My requirement scenario for being able to insert into an array was to add consul_agent job onto an instance_group such as etcd for SSL support. I assumed /0 was prepend but that replaces the first time.

If we need another single character for prepend, then since - is append, perhaps + for prepend.

- type: replace
  path: /instance_groups/name=etcd/jobs/+
  value:

And similarly, I'd want consul instance group to be prepended before etcd in instance_groups: list.

[geofffranks]

+1

[cppforlife]

resolved in #11