Reuse bolt DB configuration in the tree service

[fyrchik]

Related #1522

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (tree-service@8bf481e). Click here to learn what that means.
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@@               Coverage Diff               @@
##             tree-service    #1538   +/-   ##
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  Coverage                ?   32.99%           
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  Files                   ?      332           
  Lines                   ?    22247           
  Branches                ?        0           
===============================================
  Hits                    ?     7340           
  Misses                  ?    14311           
  Partials                ?      596           

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