config: add "modules" repository to "enabled"

Before, many tarantool modules pushes only to the tarantool repositories. Now we push the modules to old tarantool repositories (for backward compatibility) and to the "modules" repository.

Author: LeonidVas

config.default

@@ -18,6 +18,7 @@
  "2.8"
  ],
  "enabled": [
+ "modules",
  "1.10",
  "2.1",
  "2.2",