Added support for logging policies

[jkowalski]

Fixes #1450

[codecov]

Codecov Report

Merging #1472 (07686e6) into master (c086821) will increase coverage by 0.20%.
The diff coverage is 88.35%.

@@            Coverage Diff             @@
##           master    #1472      +/-   ##
==========================================
+ Coverage   68.52%   68.72%   +0.20%     
==========================================
  Files         367      371       +4     
  Lines       29045    29266     +221     
==========================================
+ Hits        19902    20113     +211     
- Misses       7491     7498       +7     
- Partials     1652     1655       +3     

Impacted Files	Coverage Δ
cli/command_policy_set_files.go	77.77% <0.00%> (ø)
repo/logging/null_logger.go	71.42% <0.00%> (ø)
snapshot/policy/policy_tree.go	100.00% <ø> (ø)
snapshot/snapshotfs/upload_actions.go	61.84% <16.66%> (ø)
cli/command_snapshot_create.go	71.38% <37.50%> (-1.89%)	⬇️
cli/command_policy_set_compression.go	73.17% <50.00%> (ø)
cli/command_policy_set.go	56.98% <72.22%> (+3.10%)	⬆️
fs/ignorefs/ignorefs.go	78.31% <85.71%> (ø)
snapshot/snapshotfs/upload.go	78.32% <88.72%> (+1.76%)	⬆️
cli/command_policy_set_logging.go	100.00% <100.00%> (ø)
... and 22 more

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