Add CI test for FreeBSD

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (a2c78e1) 22.79% compared to head (5ed7724) 22.79%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #1128 +/- ## ======================================= Coverage 22.79% 22.79% ======================================= Files 42 42 Lines 8536 8536 ======================================= Hits 1946 1946 Misses 6590 6590 ``` | [Impacted Files](https://app.codecov.io/gh/ntop/n2n/pull/1128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/edge\_management.c](https://app.codecov.io/gh/ntop/n2n/pull/1128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL2VkZ2VfbWFuYWdlbWVudC5j) | `0.00% <0.00%> (ø)` | | | [src/management.c](https://app.codecov.io/gh/ntop/n2n/pull/1128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL21hbmFnZW1lbnQuYw==) | `0.00% <0.00%> (ø)` | | | [src/sn\_management.c](https://app.codecov.io/gh/ntop/n2n/pull/1128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3NuX21hbmFnZW1lbnQuYw==) | `0.00% <0.00%> (ø)` | |

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