Merge bitcoin/bitcoin#26681: contrib: Bugfix for checking bad dns seeds without casting in `makeseeds.py`

3cc989da5c750e740705131bed05bbf93bfdf169 Fix checking bad dns seeds without casting (Yusuf Sahin HAMZA)

Pull request description:

  - Since seed lines comes with `str` type, comparing `good` column directly with **0** (`int` type) in the if statement was not working at all. This is fixed by casting `int` type to the values in the `good` column of seeds text file.
  - Lines that starts with comment in the seeds text file are now ignored.
  - If statement for checking bad seeds are moved to the top of the `parseline` function as if a seed is bad; there is no point of going forward from there.

  Since this bug-fix eliminates bad seeds over **550k** in the first place, in my case; particular job for parsing all seeds speed is up by **600%** and whole script's speed is up by **%30**.

  Note that **stats** in the terminal are not going to include bad seeds after this fix, which would be the same if this bug were never there before.

ACKs for top commit:
  achow101:
    ACK 3cc989da5c750e740705131bed05bbf93bfdf169
  jonatack:
    ACK 3cc989da5c750e740705131bed05bbf93bfdf169

Tree-SHA512: 13c82681de4d72de07293f0b7f09721ad8514a2ad99b0584d1c94fa5f2818821df2000944f9514d6a222a5dccc82856d16c8c05aa36d905cfa7d4610c629fd38

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