Use --detach in tests to avoid waiting

tests/kdc/check-des.in

@@ -96,14 +96,8 @@ ${kadmin} check ${R} || exit 1
 echo foo > ${objdir}/foopassword
 
 echo Starting kdc; > messages.log
-${kdc} &
-kdcpid=$!
-
-sh ${wait_kdc}
-if [ "$?" != 0 ] ; then
-    kill -9 ${kdcpid}
-    exit 1
-fi
+${kdc} --detach --testing || { echo "kdc failed to start"; exit 1; }
+kdcpid=`getpid kdc`
 
 trap "kill -9 ${kdcpid}; echo signal killing kdc; exit 1;" EXIT