Move out gbproxy to its own subdir

Change-Id: I2cc98d3a276d953609bbbbaa9782a0112687791e
diff --git a/osmoappdesc.py b/osmoappdesc.py
index f610e77..1c47aee 100644
--- a/osmoappdesc.py
+++ b/osmoappdesc.py
@@ -23,7 +23,7 @@
 }
 
 
-apps = [(4246, "src/gprs/osmo-gbproxy", "OsmoGbProxy", "gbproxy"),
+apps = [(4246, "src/gbproxy/osmo-gbproxy", "OsmoGbProxy", "gbproxy"),
         (4245, "src/gprs/osmo-sgsn", "OsmoSGSN", "sgsn"),
         (4253, "src/gprs/osmo-gtphub", "OsmoGTPhub", "gtphub")
         ]