Merge branch '104-url-of-submodule-should-be-relative-on-gitlab-server' into 'develop'

Resolve "Url of submodule should be relative on Gitlab server"

See merge request !376

.gitmodules

 [submodule "tests/tests_api"]
 	path = tests/tests_api
-	url = https://gitlab.syncad.com/hive/tests_api.git
+	url = ../../hive/tests_api.git