support mount.juicefs graceful upgrade

[zhijian-pro]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 55.32%. Comparing base (c4a7bd9) to head (8cee552).

Files	Patch %	Lines
cmd/main.go	12.50%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4487      +/-   ##
==========================================
- Coverage   55.37%   55.32%   -0.06%     
==========================================
  Files         157      157              
  Lines       41222    41229       +7     
==========================================
- Hits        22825    22808      -17     
- Misses      15869    15891      +22     
- Partials     2528     2530       +2     

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