Switch all submodules to https.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

.gitmodules

@@ -1,9 +1,9 @@
 [submodule "admin"]
 	path = admin
-	url = http://system@scm.trinitydesktop.org/scm/git/tde-common-admin
+	url = https://system@scm.trinitydesktop.org/scm/git/tde-common-admin
 [submodule "cmake"]
 	path = cmake
-	url = http://system@scm.trinitydesktop.org/scm/git/tde-common-cmake
+	url = https://system@scm.trinitydesktop.org/scm/git/tde-common-cmake
 [submodule "libltdl"]
 	path = libltdl
-	url = http://system@scm.trinitydesktop.org/scm/git/libltdl
+	url = https://system@scm.trinitydesktop.org/scm/git/libltdl