Merge branch 'SW-931-fix-cobalt-tests' into 'LOFAR-Release-4_0'

Resolve SW-931 "Fix cobalt tests"

Closes SW-931

See merge request !221 (merged)

(cherry picked from commit e3d892d6)

b8a772cc Fixed typo (missing quote) 892aea24 Merge branch 'master' of https://git.astron.nl/ro/lofar d1dcd2d3 Merge branch 'master' of https://git.astron.nl/ro/lofar c9754522 Merge branch 'master' of https://git.astron.nl/ro/lofar bd75c484 SW-931: Support tuned.service not being installed when confirming its inactive 7816a56d SW-931: Fix MTU test in presence of VLANs