overlord/ifacestate: refresh udev backend on startup

[zyga]

With the recent fixes to the udev snippets of various interfaces we need
to refresh udev profiles on startup. Note that like all profiles, those
are only refreshed if they differ from the values we intend have.

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

[codecov-io]

Codecov Report

Merging #4037 into release/2.28 will increase coverage by <.01%.
The diff coverage is 100%.

@@               Coverage Diff                @@
##           release/2.28    #4037      +/-   ##
================================================
+ Coverage         75.68%   75.68%   +<.01%     
================================================
  Files               413      413              
  Lines             35565    35565              
================================================
+ Hits              26918    26919       +1     
  Misses             6742     6742              
+ Partials           1905     1904       -1

Impacted Files	Coverage Δ
overlord/ifacestate/helpers.go	62.33% <100%> (ø)	⬆️
cmd/snap/cmd_aliases.go	93.33% <0%> (-1.67%)	⬇️
interfaces/sorting.go	98.71% <0%> (-1.29%)	⬇️
overlord/snapstate/snapstate.go	80.4% <0%> (+0.25%)	⬆️

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[stolowski]

LGTM