Preserve test dir if early_error fails

Author: rocallahan

src/test/early_error.run

@@ -1,4 +1,5 @@
 source `dirname $0`/util.sh
 save_exe "$TESTNAME"
 _RR_TRACE_DIR="$workdir" test-monitor $TIMEOUT record.err "./$TESTNAME-$nonce" \
-    $(which rr) $GLOBAL_OPTIONS record $LIB_ARG $RECORD_ARGS "./$TESTNAME-$nonce"
+    $(which rr) $GLOBAL_OPTIONS record $LIB_ARG $RECORD_ARGS "./$TESTNAME-$nonce" \
+    || failed "didn't get expected startup error"