guest: Forward debian guest daemons' logs to journal

Bug: 400904451
Test: sudo journalctl -p debug
Change-Id: I42d45724f3e68ca571faed1a21f4ef28d8b66781
diff --git a/guest/forwarder_guest_launcher/debian/service b/guest/forwarder_guest_launcher/debian/service
index 6824c70..ad57a26 100644
--- a/guest/forwarder_guest_launcher/debian/service
+++ b/guest/forwarder_guest_launcher/debian/service
@@ -11,6 +11,8 @@
 RestartSec=1
 User=root
 Group=root
+StandardOutput=journal
+StandardError=journal
 
 [Install]
 WantedBy=multi-user.target
diff --git a/guest/shutdown_runner/debian/service b/guest/shutdown_runner/debian/service
index 7188d36..2668930 100644
--- a/guest/shutdown_runner/debian/service
+++ b/guest/shutdown_runner/debian/service
@@ -10,6 +10,8 @@
 RestartSec=1
 User=root
 Group=root
+StandardOutput=journal
+StandardError=journal
 
 [Install]
 WantedBy=multi-user.target