tests: avoid new failure of the daemon-conf test

* tests/daemon-conf: Accommodate the fact that out template,
daemon/libvirtd.conf now contains an invalid host_uuid.
Convert it to a valid one before the final libvirtd-running
test that must terminate normally.

tests/daemon-conf

@@ -83,7 +83,11 @@ if test 108 -lt `echo $SOCKPATH | wc -c`; then
     skip_test_ "CWD too long"
 fi
 
-$abs_top_builddir/daemon/libvirtd --pid-file=pid-file --config=tmp.conf > log 2>&1 & pid=$!
+# Replace the invalid host_uuid with one that is valid:
+sed 's/^\(host_uuid =.*\)0"$/\11"/' tmp.conf > k; mv k tmp.conf
+
+$abs_top_builddir/daemon/libvirtd --pid-file=pid-file --config=tmp.conf \
+    > log 2>&1 & pid=$!
 sleep $sleep_secs
 kill $pid