Fix uPnP issues. Correct registration and update with uPnP

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index 44992c096673ace578ba5248db7019ba1e0d78d5..73a772ac4754734c57ecbc1149cbe665acd2f376 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 44992c096673ace578ba5248db7019ba1e0d78d5
+Subproject commit 73a772ac4754734c57ecbc1149cbe665acd2f376