Issue 110 tests improvements connlist pkg

[shireenf-ibm]

issue #110

• this PR , includes tests improvements to connlist_test.go file
  all test funcs run in parallel, and for each test func, all cases run in parallel too.

• tried to split TestXXX funcs by "testing cases" to avoid if else conditions in the test functionality

• this PR does not handle generating/overriding expected output files (prefer to keep it for a separate PR, want to study if it is possible to write a workflow that could be run by go test --override (for example))

[adisos]

Looks very good!
Added a few comments.

[adisos]

issue #110

* this PR , includes tests improvements to `connlist_test.go` file
  all test `funcs` run in parallel, and for each `test func, all cases run in parallel too.`

* tried to split `TestXXX` funcs by "testing cases" to avoid `if else` conditions in the test functionality

* this PR does not handle generating/overriding expected output files (prefer to keep it for a separate PR, want to study if it is possible to write a workflow that could be run by `go test --override` (for example))

As for generating/overriding expected output files -- please consider we also need to be able to run this locally, not necessarily in a workflow.

[shireenf-ibm]

this commit
fixes the lint issue on master branch