Added ability to update configfile

[codecov[bot]]

Codecov Report

Patch coverage: 81.39% and project coverage change: +3.21 :tada:

Comparison is base (06a81c7) 50.07% compared to head (8565232) 53.28%.

:exclamation: Current head 8565232 differs from pull request most recent head 6024058. Consider uploading reports for the commit 6024058 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #485 +/- ## ========================================== + Coverage 50.07% 53.28% +3.21% ========================================== Files 10 10 Lines 681 760 +79 ========================================== + Hits 341 405 +64 - Misses 340 355 +15 ``` | [Impacted Files](https://codecov.io/gh/modoboa/modoboa-installer/pull/485?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=modoboa) | Coverage Δ | | |---|---|---| | [modoboa\_installer/ssl.py](https://codecov.io/gh/modoboa/modoboa-installer/pull/485?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=modoboa#diff-bW9kb2JvYV9pbnN0YWxsZXIvc3NsLnB5) | `20.83% <0.00%> (ø)` | | | [run.py](https://codecov.io/gh/modoboa/modoboa-installer/pull/485?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=modoboa#diff-cnVuLnB5) | `52.41% <23.07%> (-3.23%)` | :arrow_down: | | [tests.py](https://codecov.io/gh/modoboa/modoboa-installer/pull/485?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=modoboa#diff-dGVzdHMucHk=) | `95.55% <90.47%> (-1.63%)` | :arrow_down: | | [modoboa\_installer/utils.py](https://codecov.io/gh/modoboa/modoboa-installer/pull/485?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=modoboa#diff-bW9kb2JvYV9pbnN0YWxsZXIvdXRpbHMucHk=) | `55.85% <94.11%> (+7.24%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=modoboa). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=modoboa)

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