remove config hash when namespace is excluded

[eytan-avisror]

Signed-off-by: Eytan Avisror eytan_avisror@intuit.com

Fixes #235

• Moves setting of config hash up to controller level, will now unset configHash field if configmap is nil/empty/does not exist.

• Refactors namespace exclusion logic into IsNamespaceExcluded method

• Refactors UpdateStatus to use patch instead of update, in order avoid metadata changes causing a reconcile loop - in k8s 1.18 managedFields was introduced along with a time field which causes this problem when using Update method. For now this implements a custom StatusPatch, in the future we might want something similar to Reconcile Improvements - evaluate using Event Filters #240

• BDD Passing

@backjo

[codecov]

Codecov Report

Merging #236 (4f7d437) into master (eb0627c) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   87.90%   87.89%   -0.02%     
==========================================
  Files          17       17              
  Lines        2207     2205       -2     
==========================================
- Hits         1940     1938       -2     
  Misses        162      162              
  Partials      105      105              

Impacted Files	Coverage Δ
controllers/provisioners/eks/eks.go	84.21% <ø> (-0.79%)	⬇️

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[eytan-avisror]

27 scenarios (27 passed)
147 steps (147 passed)
28m47.254921999s
testing: warning: no tests to run
PASS
ok  	github.com/keikoproj/instance-manager/test-bdd	1727.554s [no tests to run]