[BUG][POSTMAN] Random order of the Postman requests

[gcatanese]

The generated Postman collection presents the requests in a random order, for example:

/users
/groups
/users/{id}
/groups/{id}

The generator should sort the requests by path to make sure Postman displays all requests for a given endpoint together, for example:

/groups
/groups/{id}
/users
/users/{id}