Merge branch 'support-2550' of...

Merge branch 'support-2550' of https://gitlab.demlabs.net/cellframe/libdap-server-udp into support-2550
local merge

.gitmodules

 [submodule "test/libdap-test"]
     path = test/libdap-test
-    url = https://github.com/cellframe/libdap-test
+    url = https://gitlab.demlabs.net/cellframe/libdap-test
     branch = master 
 [submodule "libdap"]
   path = libdap
-  url = https://github.com/cellframe/libdap
+  url = https://gitlab.demlabs.net/cellframe/libdap
   branch = master 
 [submodule "libdap-server-core"]
   path = libdap-server-core
-  url = https://github.com/cellframe/libdap-server-core
+  url = https://gitlab.demlabs.net/cellframe/libdap-server-core
   branch = master