test(functional): explicitly remove deploy tokens on reset

Deploy tokens would remain in the instance if the respective project or
group was deleted without explicitly revoking the deploy tokens first.

tests/functional/conftest.py

@@ -12,8 +12,12 @@
 def reset_gitlab(gl):
     # previously tools/reset_gitlab.py
     for project in gl.projects.list():
+        for deploy_token in project.deploytokens.list():
+            deploy_token.delete()
         project.delete()
     for group in gl.groups.list():
+        for deploy_token in group.deploytokens.list():
+            deploy_token.delete()
         group.delete()
     for variable in gl.variables.list():
         variable.delete()