overlord/ifacestate: refresh all security backends on startup

[zyga]

This patch changes the initially conservative selection of backends that
are refreshed on startup (apparmor and seccomp and just recently added
udev) to accommodate all backends.

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

[codecov-io]

Codecov Report

Merging #4039 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #4039      +/-   ##
==========================================
- Coverage   75.86%   75.86%   -0.01%     
==========================================
  Files         431      431              
  Lines       36926    36922       -4     
==========================================
- Hits        28014    28010       -4     
  Misses       6958     6958              
  Partials     1954     1954

Impacted Files	Coverage Δ
overlord/ifacestate/helpers.go	62.5% <100%> (-0.5%)	⬇️

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