DRY test setup functions on lsps2_integration_tests

[martinsaposnic]

from this PR #3838

see:

#3838 (comment)
#3838 (comment)
#3838 (comment)
#3838 (comment)

[Abeeujah]

Hi @martinsaposnic there seems to have been changes since you created this issue, is this stale now?

[tnull]

Hi @martinsaposnic there seems to have been changes since you created this issue, is this stale now?

I think there are surely cases that could still be DRYed up, but probably not that important right now. Closing.