Label bootstrap instances on an update

[dgageot]

Fix #404

[codecov-io]

Codecov Report

Merging #405 into master will decrease coverage by -0.09%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #405      +/-   ##
==========================================
- Coverage   62.15%   62.06%   -0.09%     
==========================================
  Files          62       62              
  Lines        3580     3580              
==========================================
- Hits         2225     2222       -3     
- Misses       1106     1107       +1     
- Partials      249      251       +2

Impacted Files	Coverage Δ
pkg/plugin/group/scaler.go	91.21% <100%> (+1.4%)	✅
pkg/plugin/group/rollingupdate.go	90.76% <100%> (ø)	✅
pkg/plugin/group/scaled.go	81.48% <100%> (+2.31%)	✅
pkg/plugin/group/quorum.go	86.84% <100%> (ø)	✅
pkg/manager/group_plugin_impl.go	14.89% <ø> (-4.26%)	❌
pkg/manager/manager.go	63.63% <ø> (-2.43%)	❌

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[chungers]

LGTM