fix(snapshots): Partly fix #544 by supporting setuid/setgid/sticky bits …

[lciti]

…when snapshotting, restoring and fuse-mounting.

Also modified an end-to-end test to also check that these extra mode flags work when snapshotting+restoring. Manually tested fuse-mount.

[codecov]

Codecov Report

Base: 74.86% // Head: 74.91% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (4774377) compared to base (fa5aaa4).
Patch coverage: 11.76% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2597      +/-   ##
==========================================
+ Coverage   74.86%   74.91%   +0.04%     
==========================================
  Files         452      452              
  Lines       35478    35491      +13     
==========================================
+ Hits        26562    26587      +25     
+ Misses       7030     7026       -4     
+ Partials     1886     1878       -8     

Impacted Files	Coverage Δ
fs/entry.go	93.87% <ø> (ø)
internal/fusemount/fusefs.go	0.00% <0.00%> (ø)
snapshot/restore/local_fs_output.go	65.27% <50.00%> (ø)
snapshot/snapshotfs/upload.go	85.28% <100.00%> (ø)
internal/epoch/epoch_manager.go	85.29% <0.00%> (+0.48%)	⬆️
repo/content/index/index_v1.go	76.17% <0.00%> (+1.17%)	⬆️
internal/server/source_manager.go	82.95% <0.00%> (+2.29%)	⬆️
cli/command_content_verify.go	81.51% <0.00%> (+5.88%)	⬆️
internal/dirutil/mksubdirall.go	100.00% <0.00%> (+7.89%)	⬆️

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[lciti]

I don't think the Windows failed test has anything to do with the PR. Is there anything left for me to do before this is ready to be merged?