bugfix: change Flags to PersistentFlags

[faycheng]

Ⅰ. Describe what this PR did

change Flags to PersistentFlags

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

Daemon config file is invalid while using Flags.

> cat /etc/pouch/config.json
{"debug": true}
> pouchd
ERRO[0000] failed to load daemon file: unknow flags: debug

[codecov-io]

Codecov Report

Merging #958 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #958   +/-   ##
=======================================
  Coverage   13.06%   13.06%           
=======================================
  Files         123      123           
  Lines        8235     8235           
=======================================
  Hits         1076     1076           
  Misses       7063     7063           
  Partials       96       96

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[allencloud]

Could you help to take a look at this? @HusterWan
Also cc @yyb196 Maybe it is related to the issue we discussed several days ago.

[HusterWan]

cat /etc/pouch/config.json
{"debug": true}
pouchd
ERRO[0000] failed to load daemon file: unknow flags: debug

@faycheng i cannot replay this error, i think this problem maybe caused by PR #917 , we have revert this code.

so maybe you should rebase you local code with upstream/master, and try again.

if you can still occur this error, please let me know, thanks a lot.

[faycheng]

@HusterWan you are right.soon after this error raised, i wished only to fix it and i didn't find it reverted.i feel deeply ashamed for creating this pr. sorry

[allencloud]

That is all right. Never mind. We sincerely appreciate your work. Feel free to tell us if you meet any question here.