test-runner now supports interface name replacement inside hostapd
config files. Since a given test configuration doesn't know what
interface names there will be $ifaceN can be specified instead e.g.
rsn_preauth_interfaces=$iface0 $iface1
The $ifaceN values will be replace with actual interface names when
the test is started.
This patch also removes ctrl_interface inside the hostapd config
files as this is no longer required.
Unfortunately this doesn't currently ensure that the preauthentication
has succeeded and that later the PMKSA from the preauthentication was
used in the transition, only that the preauthentication process doesn't
break the transition. For now this can be confirmed by looking at the
testrunner -v output to see that the line "EAP completed with eapSuccess"
appears before the following line, and not after:
src/device.c:device_enter_state() Old State: connected, new state: roaming
