lib: Move vlog.h to <openvswitch/vlog.h>

A new function vlog_insert_module() is introduced to avoid using
list_insert() from the vlog.h header.

Signed-off-by: Thomas Graf <tgraf@noironetworks.com>
Acked-by: Ben Pfaff <blp@nicira.com>

lib/odp-util.c

@@ -37,7 +37,7 @@
 #include "timeval.h"
 #include "unaligned.h"
 #include "util.h"
-#include "vlog.h"
+#include "openvswitch/vlog.h"
 
 VLOG_DEFINE_THIS_MODULE(odp_util);