Main changes for kube/cluster-init.sh for multi-node cluster handling

[naiming-zededa]

• create the cluster-utils.sh in pkg/kube for a number of functions
• get EdgeNodeClusterStatus from 'zedkube' for cluster status, cluster nodeip, cluster prefix, etc
• a background process to monitor the cluster mode changes
• implement cluster mode change logic and operations for change from single-node to cluster, or from cluster back to single-node
• save kube /var/lib at single-node first time setup for later use when the mode changes back from cluster mode to single node
• display eve-release string for get node OS-IMAGE field
• this patch tested still works in kubevirt single-node case.
• some of the external_boot_img changes in the patch is from Andrew's diff.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 20.93%. Comparing base (dd27fe1) to head (c030dfa). Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4385   +/-   ##
=======================================
  Coverage   20.93%   20.93%           
=======================================
  Files          13       13           
  Lines        2895     2895           
=======================================
  Hits          606      606           
  Misses       2163     2163           
  Partials      126      126           

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[deitch]

Looks like it needs to be rebased.

[naiming-zededa]

Looks like it needs to be rebased.

Hi @deitch rebased in the update. hi @andrewd-zededa, i have resolved some conflicts, in particular this:

        if ! external_boot_image_import; then
                continue
        fi

please check to see if this is in the intended place.

[eriknordmark]

hi @andrewd-zededa, i have resolved some conflicts, in particular this:

@andrewd-zededa can you respond to this and take another look?