Rename aws-k8s to aws-k8s-1.15

[tjkirch]

commit 5666387cbfd3c5f6c253ba5fa7e00dd1cd1e3a8d
Author: Tom Kirchner <[email protected]>
Date:   Wed Feb 26 14:07:12 2020 -0800

updog: print space between variant and version rather than hyphen

Variant names can include versions (e.g. aws-k8s-1.15) and seeing that combined
with the update version using a hyphen can be confusing.  For example, in
aws-k8s-1.15-0.3.0, it's unclear what each version applies to.  This change
uses a space instead, to visually separate the two components.

commit 60ebe8c47f5fcd3e92e2479c94395456efa4817b
Author: Tom Kirchner <[email protected]>
Date:   Wed Feb 26 14:07:03 2020 -0800

Rename aws-k8s variant to aws-k8s-1.15

This requires removing the variants workspace, which we had intended to do
anyway because you wouldn't want to build the whole workspace.  It needs to be
removed now because "." isn't valid in a package name, and we were passing the
variant name to build the variant's "package".

---

Testing done:

Unit tests pass. Built an image, ran a pod OK, API settings OK. os-release shows new variant:

bash-5.0# cat /etc/os-release 
NAME=Bottlerocket
ID=bottlerocket
PRETTY_NAME="Bottlerocket OS 0.3.0"
VARIANT_ID=aws-k8s-1.15
VERSION_ID=0.3.0
BUILD_ID=c047e914-dirty

[tjkirch]

@bcressey pointed out that nothing actually uses the crate names where this appears (/variants/FOO, /sources/models/src/FOO), so we can use the "." where we want to normally, and the "_" just in those two places that don't matter.

Trying this now.

[tjkirch]

This push gets us back to "aws-k8s-1.15" (with the dot) by removing the variants workspace, which wasn't helpful anyway. Testing updated.