Move SNMP session setup to Task initialization

[johannaengland]

After @hmpf's review I decided it might actually be nicer to factor out this part of the PR #133.

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions[bot]]

Test results

    3 files      3 suites   25s :stopwatch: 206 tests 206 :heavy_check_mark: 0 :zzz: 0 :x: 618 runs  616 :heavy_check_mark: 2 :zzz: 0 :x:

Results for commit 2f42c9be.

:recycle: This comment has been updated with latest results.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (77c10bf) 97.85% compared to head (2f42c9b) 97.85%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #151 +/- ## ========================================== - Coverage 97.85% 97.85% -0.01% ========================================== Files 31 31 Lines 2377 2370 -7 ========================================== - Hits 2326 2319 -7 Misses 51 51 ```

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