[Tile-serving] [openstreetmap/mod_tile] Added missing signal handlers (PR #364)

[Codecov Comments Bot]

## [Codecov](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/364?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) Report
All modified and coverable lines are covered by tests :white_check_mark:
> Comparison is base [(`53b77bc`)](https://app.codecov.io/gh/openstreetmap/mod_tile/commit/53b77bc1dbdd393479c658508bcf529d94761bf8?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 49.16% compared to head [(`0317163`)](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/364?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 58.86%.


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<details><summary>Additional details and impacted files</summary>


```diff
@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
+ Coverage   49.16%   58.86%   +9.69%     
==========================================
  Files          23       23              
  Lines        4601     4604       +3     
==========================================
+ Hits         2262     2710     +448     
+ Misses       2339     1894     -445     
```



</details>

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