mib: add netns/mib.h file

The only structure declared within is the netns_mib, which will
carry all our mibs within. I didn't put the mibs in the existing
netns_xxx structures to make it possible to mark this one as
properly aligned and get in a separate "read-mostly" cache-line.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/netns/mib.h b/include/net/netns/mib.h
new file mode 100644
index 0000000..9f4b31e
--- /dev/null
+++ b/include/net/netns/mib.h
@@ -0,0 +1,9 @@
+#ifndef __NETNS_MIB_H__
+#define __NETNS_MIB_H__
+
+#include <net/snmp.h>
+
+struct netns_mib {
+};
+
+#endif