object/ceph: set default path for admin socket and log file

[SandyXSD]

Limitations:

1. Values in both ceph.conf and cluster internal configurations (ceph config) will be overwritten. To adjust these options we have to set the corresponding envs
2. Only ONE active client can have the admin socket enabled. A pid field may be added into the path later if the connection can be closed gracefully.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.51%. Comparing base (7d8c36e) to head (374d8c3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4608      +/-   ##
==========================================
- Coverage   55.52%   55.51%   -0.01%     
==========================================
  Files         159      159              
  Lines       42984    42984              
==========================================
- Hits        23866    23862       -4     
- Misses      16459    16460       +1     
- Partials     2659     2662       +3     

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