Add WakeupController and NFLogListener

These classes work together to parse and dispatch NFLOG messages in
response to inbound packets annotated by the WiFi driver.

Test: as follows
    - built
    - flashed
    - booted
    - netd_unit_test passes

Change-Id: Id26d62858bf4bc4186ae66850f08077adf6fc2ac
diff --git a/libnetdutils/include/netdutils/Status.h b/libnetdutils/include/netdutils/Status.h
index eacf791..5a89289 100644
--- a/libnetdutils/include/netdutils/Status.h
+++ b/libnetdutils/include/netdutils/Status.h
@@ -78,6 +78,8 @@
 // TODO: msg is only a placeholder for now
 Status statusFromErrno(int err, const std::string& msg);
 
+std::string toString(const Status status);
+
 std::ostream& operator<<(std::ostream& os, const Status& s);
 
 #define RETURN_IF_NOT_OK_IMPL(tmp, stmt)           \