add no-update in mount to avoid query against JuiceFS Web Console repeatedly

[zwwhdls]

fix #611

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (4d0c5dd) 41.45% compared to head (a047701) 41.45%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #615   +/-   ##
=======================================
  Coverage   41.45%   41.45%           
=======================================
  Files          32       32           
  Lines        3435     3435           
=======================================
  Hits         1424     1424           
  Misses       1883     1883           
  Partials      128      128           

Impacted Files	Coverage Δ
pkg/juicefs/mount/builder/pod.go	55.88% <100.00%> (ø)

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