This ensures that packets on sun are processed on a particular CPU and
not randomly on one, which causes expected SAs not to get created or
other weird things.
Some scenarios disable route installation and if they are executed before
any scenarios that don't, there won't be a rule for table 220 and we get
"FIB table does not exist" errors.
In particular the swanctl calls all take a while and this allows doing
them in parallel if multiple hosts are involved. This reduces the runtime
of each test by 1-3 seconds.
Tobias Brunner