Config changes matching cnpool tests added in osmo-ttcn3-hacks, see
'Related'.
Keep a copy of the old config files named "-legacy", to not break the
'latest' tests, because osmo-hnbgw 'latest' does not yet support the new
config options.
Depends: osmo-ttcn3-hacks I027a059faed3f140f8801f84338956cd004043b5
Change-Id: I94aa0b2adfc48b98cb4b1efe595c2432fc603d6c