recursive again, but with relative urls for submodules

.gitlab-ci.yml

 variables:
-  GIT_SUBMODULE_STRATEGY: normal
+  GIT_SUBMODULE_STRATEGY: recursive
 
 stages:
   - build

.gitmodules

 [submodule "relast-preprocessor"]
 	path = relast-preprocessor
-	url = git@git-st.inf.tu-dresden.de:jastadd/relast-preprocessor.git
+	url = ../../jastadd/relast-preprocessor.git
   branch = jastadd-fix-inc-param-debug
 [submodule "ragconnect.base/src/main/jastadd/mustache"]
 	path = ragconnect.base/src/main/jastadd/mustache
-	url = git@git-st.inf.tu-dresden.de:jastadd/mustache.git
+	url = ../../jastadd/mustache.git