Store groups - Add sorting field

[ihor-sviziev]

For now we have sorting store groups by store group name only. We should add sort_order field(like for store views) and sort by it. It's needed if we have few store groups and switcher between store groups on our website, now we haven't ability manage orders.

[verklov]

@igor-svizev, thank you for your suggestion! Assigning this issue for review by @eleonova. I guess Elena will be able to respond to this issue better.

[vpelipenko]

Internal ticket: MAGETWO-25647

[piotrekkaminski]

Thank you for your submission.

We recently made some changes to the way we process GitHub submissions to more quickly identify and respond to core code issues.

Feature Requests and Improvements should now be submitted to the new Magento 2 Feature Requests and Improvements forum (see details here).

We are closing this GitHub ticket and have moved your request to the new forum.