set ovs_user_id for openvswitch and ovn so they run in non root

also ensure hugepage mount directory can be write by QEMU user
with id 42424

Change-Id: Ib249e15240e9feb1c1029cba4b5bcc4f018fbc10
diff --git a/images/openvswitch/Dockerfile b/images/openvswitch/Dockerfile
index 369f313..b908c55 100644
--- a/images/openvswitch/Dockerfile
+++ b/images/openvswitch/Dockerfile
@@ -16,4 +16,6 @@
     tcpdump
 dnf -y clean all
 rm -rf /var/cache/dnf
+usermod -u 42424 openvswitch
+groupmod -g 42424 openvswitch
 EOF