ikev1 xauth but no modecfg; quick request has invalid hardwired lease

- establish using main mode
- server authenticates client using XAUTH

MODE_CFG is skipped

- client then initiates Quick Mode proposing hardwired but wrong lease

it gets rejected

Note: to get this behaviour modecfgserver=no modecfgclient=no
modeconfigpull=yes is needed, see github/1961.

For background see github/1955
