hadoop: user root in sdk as normal user

[tangyoupeng]

If you used user root as superuser before. This pr will change the behaviour. If you still want to use root as superuser, you can add user root to supergroup use config juicefs.supergroup and juicefs.groups

[codecov-commenter]

Codecov Report

Base: 55.70% // Head: 55.66% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (f703609) compared to base (6d7c905).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head f703609 differs from pull request most recent head 05f1733. Consider uploading reports for the commit 05f1733 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3213      +/-   ##
==========================================
- Coverage   55.70%   55.66%   -0.04%     
==========================================
  Files         142      142              
  Lines       33048    33051       +3     
==========================================
- Hits        18410    18399      -11     
- Misses      12698    12708      +10     
- Partials     1940     1944       +4     

Impacted Files	Coverage Δ
cmd/mount.go	55.01% <0.00%> (-0.34%)	⬇️
pkg/meta/dump.go	75.48% <ø> (ø)
pkg/chunk/disk_cache.go	72.61% <0.00%> (-1.24%)	⬇️
pkg/vfs/handle.go	83.58% <0.00%> (-0.75%)	⬇️
pkg/meta/sql.go	58.92% <0.00%> (-0.15%)	⬇️
pkg/meta/tkv_mem.go	93.60% <0.00%> (+1.16%)	⬆️

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[tangyoupeng]

#3214