bootstrap improvements

[eytan-avisror]

Fixes #101

• add locking around bootstrap, and call bootstrap on updates before we wait for nodes

• make sure not to remove auth role if it's shared between instancegroups

• BDD test

[codecov]

Codecov Report

Merging #102 into master will decrease coverage by 0.22%.
The diff coverage is 82.85%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   87.31%   87.09%   -0.23%     
==========================================
  Files          10       10              
  Lines         954      984      +30     
==========================================
+ Hits          833      857      +24     
- Misses         88       91       +3     
- Partials       33       36       +3     

Impacted Files	Coverage Δ
controllers/provisioners/eks/delete.go	96.87% <0.00%> (-3.13%)	⬇️
controllers/provisioners/eks/eks.go	64.86% <ø> (ø)
controllers/provisioners/eks/update.go	93.86% <33.33%> (-1.14%)	⬇️
controllers/provisioners/eks/helpers.go	79.55% <90.90%> (+1.23%)	⬆️
controllers/provisioners/eks/create.go	100.00% <100.00%> (ø)
controllers/provisioners/eks/upgrade.go	96.05% <100.00%> (+0.21%)	⬆️

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[vgunapati]

LGTM 🚀