Improve logs

[dgageot]

• Simplify the code: we don't need to reconnect the watch if we give a proper timeout.
• Fix a bug where we could miss a few logs. Add a few tests and comments.

[dgageot]

ping @bobcatfish This comes from the discussion we've had on the code that prints the logs.

[codecov-io]

Codecov Report

Merging #918 into master will increase coverage by 0.19%.
The diff coverage is 15.62%.

@@            Coverage Diff             @@
##           master     #918      +/-   ##
==========================================
+ Coverage   41.71%   41.91%   +0.19%     
==========================================
  Files          61       61              
  Lines        2522     2522              
==========================================
+ Hits         1052     1057       +5     
+ Misses       1356     1351       -5     
  Partials      114      114

Impacted Files	Coverage Δ
pkg/skaffold/kubernetes/log.go	4.09% <15.62%> (+4.09%)	⬆️

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