init: Set QEMU state dir/PID file path directly

This fixes #101 for me.

I'm not sure why I didn't used to hit this, but on my host system
/var/local/run is owned by a privilged user and has no global write
perms, but is also the default where the qemu-ga build writes these
files to.

Fix is just to set it explicitly to the default that exists on other
systems, which the init script is already set up to handle.

src/init/init.sh.template

@@ -99,7 +99,11 @@ if [[ -e /dev/kmsg ]]; then
 fi
 
 log "Spawning qemu-ga in the background"
-qemu-ga --method=virtio-serial --path="$vport" $qga_logs -d
+# These --statedir and --pidfile match th default on typical QEMU builds, but
+# versions exist where the default is something else. See
+# https://github.com/danobi/vmtest/issues/101
+qemu-ga --statedir /var/run --pidfile /var/run/qemu-ga.pid \
+    --method=virtio-serial --path="$vport" $qga_logs -d
 
 
 # Run a login shell