Log warning message when deprecated network name 'tor' is used (e.g. option onlynet=tor)
Log warning message when deprecated network name 'tor' is used (e.g. option onlynet=tor)

Summary: This is a backport of core PR13532

Test Plan:
  make check

The function is unit tested

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D2823

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