Remove usage of folly::Expected.

[szmyd]

No description provided.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.27%. Comparing base (370c772) to head (de6714d).
⚠️ Report is 69 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #284      +/-   ##
==========================================
- Coverage   64.29%   61.27%   -3.03%     
==========================================
  Files          72       70       -2     
  Lines        4406     4741     +335     
  Branches      555      646      +91     
==========================================
+ Hits         2833     2905      +72     
- Misses       1327     1573     +246     
- Partials      246      263      +17     

Components	Coverage Δ
AuthManager	77.77% <ø> (ø)
Cache	37.85% <76.92%> (+7.91%)	⬆️
FDS	74.83% <92.85%> (+3.71%)	⬆️
FileWatcher	58.51% <60.00%> (+2.26%)	⬆️
Flip	65.34% <ø> (ø)
gRPC	76.04% <62.16%> (-1.01%)	⬇️
Logging	15.25% <3.83%> (-14.93%)	⬇️
Metrics	80.57% <ø> (+0.36%)	⬆️
Options	100.00% <ø> (ø)
Setting	57.61% <ø> (+0.82%)	⬆️
StatusObject	73.83% <ø> (ø)
Utility	83.51% <100.00%> (+0.80%)	⬆️
Version	95.83% <ø> (ø)

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