The doc/examples/osmo-msc SCCP config examples with 10.23.42.1 as asp ip-remote
cause >5 minutes timeout for each VTY config test being run before the VTY
becomes available. This hugely elongates the config tests, we didn't spot it
before because it does succeed after that timeout. Rather use link-local
addresses in order to immediately note the lack of connection and carry on with
the VTY config tests.
Related: OS#2333
Change-Id: I5ea4ef8a7e181bd3a38edf9c3b5d098f6ba65ee5