Use mock home and monkeypatch ssh parser for ssh config testing

[unkcpz]

Part of #516

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (a1b5134) 79.39% compared to head (936de4f) 79.97%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #523 +/- ## ========================================== + Coverage 79.39% 79.97% +0.57% ========================================== Files 27 27 Lines 3849 3830 -19 ========================================== + Hits 3056 3063 +7 + Misses 793 767 -26 ``` | [Flag](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | Coverage Δ | | |---|---|---| | [python-3.10](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | `79.97% <92.85%> (+0.57%)` | :arrow_up: | | [python-3.8](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | `80.01% <92.85%> (+0.57%)` | :arrow_up: | | [python-3.9](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | `80.01% <92.85%> (+0.57%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | Coverage Δ | | |---|---|---| | [aiidalab\_widgets\_base/computational\_resources.py](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-YWlpZGFsYWJfd2lkZ2V0c19iYXNlL2NvbXB1dGF0aW9uYWxfcmVzb3VyY2VzLnB5) | `69.84% <100.00%> (-0.18%)` | :arrow_down: | | [tests/test\_computational\_resources.py](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-dGVzdHMvdGVzdF9jb21wdXRhdGlvbmFsX3Jlc291cmNlcy5weQ==) | `100.00% <100.00%> (ø)` | | | [tests/test\_structures.py](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-dGVzdHMvdGVzdF9zdHJ1Y3R1cmVzLnB5) | `100.00% <100.00%> (ø)` | | | [aiidalab\_widgets\_base/structures.py](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/523?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#diff-YWlpZGFsYWJfd2lkZ2V0c19iYXNlL3N0cnVjdHVyZXMucHk=) | `77.99% <83.33%> (+3.10%)` | :arrow_up: |

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