bz1744543 amended etcd restoration steps

[sheriff-rh]

Removed all etcd v2 references to avoid confusion. Clarified several steps per BZ below.

Bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1744543

Build preview:
http://file.rdu.redhat.com/~antaylor/bz1744543/day_two_guide/host_level_tasks.html#day-two-guide-etcd-backup

[geliu2016]

LGTM, thanks

[sburke1967]

Hi Andrew,
Step 6 of Restoring etcd data should be removed as you do not repeat this process on all the etc nodes, this is only performed on the first one to re-create a single mode cluster: http://file.rdu.redhat.com/~antaylor/bz1744543/day_two_guide/host_level_tasks.html#restoring-etcd_deprecating-etcd

Step 10 - After the first instance is running, you can add the remaining peers back into the cluster.
This should be the process for re-adding the remaining nodes back into the cluster, not just stating that it can now be done, as per https://docs.openshift.com/container-platform/3.11/admin_guide/assembly_restore-etcd-quorum.html#adding-etcd-after-restoring_restore-etcd-quorum

Cheers

Sean

[sheriff-rh]

The build preview has been updated to reflect the latest changes. Thanks @sburke1967 !

[sheriff-rh]

/cherrypick enterprise-3.11

[openshift-cherrypick-robot]

@sheriff-rh: new pull request created: #20381

In response to this:

/cherrypick enterprise-3.11

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