EOL of upgrade-manager-v0 and make upgrade-manager-v1 the default.

[shreyas-badiger]

upgrade-manager has been re-written adhering to best controller practices.

Brief overview of the latest version:

• Correct implementation of the Reconcile() operation.
• Better caching mechanism
• Replace usage of "kubectl binary" calls with "package provided kubectl api" calls.
• Table-driven unit tests pattern.

[codecov[bot]]

Codecov Report

Merging #319 (95e6f35) into master (eaea1ab) will decrease coverage by 31.07%. The diff coverage is 38.48%.

@@             Coverage Diff             @@
##           master     #319       +/-   ##
===========================================
- Coverage   69.48%   38.40%   -31.08%     
===========================================
  Files          12        7        -5     
  Lines        1160      690      -470     
===========================================
- Hits          806      265      -541     
- Misses        313      400       +87     
+ Partials       41       25       -16     

Flag	Coverage Δ
unittests	38.40% <38.48%> (-31.08%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
controllers/common/metrics.go	40.74% <ø> (-37.04%)	:arrow_down:
controllers/common/utils.go	0.00% <0.00%> (ø)
controllers/rollingupgrade_controller.go	0.00% <0.00%> (-70.00%)	:arrow_down:
controllers/script_runner.go	29.62% <26.53%> (-62.27%)	:arrow_down:
controllers/upgrade.go	44.41% <44.41%> (ø)
controllers/cloud.go	62.50% <62.50%> (ø)
controllers/metrics.go	78.46% <78.46%> (ø)
... and 1 more

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