Identify statefulsets by labels rather than error prone name parsing

[wallrj]

• Ensure that nodepool name label is added to the statefulsets created for each nodepool
• Use that label when creating nodepool status for each statefulset (rather than attempting to parse the ss name)
• Use more realistic nodepool names (including dashes) in the docs and in the tests.

Fixes: #304

Release note:

NONE

[wallrj]

In the initial commit I used - in the nodepool names, recreating the original bug report. So these tests should all fail:

• https://jetstack-build-infra.appspot.com/build/jetstack-logs/pr-logs/pull/jetstack_navigator/309/navigator-e2e-v1-7/1093/
• https://jetstack-build-infra.appspot.com/build/jetstack-logs/pr-logs/pull/jetstack_navigator/309/navigator-e2e-v1-8/1107/
• https://jetstack-build-infra.appspot.com/build/jetstack-logs/pr-logs/pull/jetstack_navigator/309/navigator-e2e-v1-9/646/

[retest-bot]

/retest This bot automatically retries jobs that failed/flaked on approved PRs (send feedback to jetstack). Review the full test history for this PR. Silence the bot with an /lgtm cancel comment for consistent failures.

[wallrj]

/lgtm cancel

[wallrj]

/lgtm

[jetstack-bot]

@wallrj: you cannot LGTM your own PR.

In response to [this](https://github.com/jetstack/navigator/pull/309#issuecomment-379251354): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/devel/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[munnerz]

/lgtm

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kragniz, munnerz, wallrj

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/jetstack/navigator/blob/master/OWNERS)~~ [kragniz,munnerz,wallrj] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[wallrj]

/retest

[kragniz]

/retest