cmd/snap-update-ns: initialize logger

[zyga]

This fixes logging (including logging of errors) from snap-update-ns.

Signed-off-by: Zygmunt Krynicki zygmunt.krynicki@canonical.com

[codecov-io]

Codecov Report

Merging #4093 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #4093      +/-   ##
==========================================
- Coverage   75.76%   75.75%   -0.01%     
==========================================
  Files         435      435              
  Lines       37441    37442       +1     
==========================================
- Hits        28366    28364       -2     
- Misses       7093     7096       +3     
  Partials     1982     1982

Impacted Files	Coverage Δ
cmd/snap-update-ns/main.go	0% <0%> (ø)	⬆️
overlord/ifacestate/helpers.go	59.6% <0%> (-0.67%)	⬇️

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