[BUGFIX release-1-13] Ensure that service:store is cleared before regsitering.

[rwjblue]

In globals apps, calling App.reset() will cause these initializers to be ran multiple times for each container / registry instance. This means that when App.reset() is called, service:store is already registered AND resolved, throwing the following error:

Cannot re-register: `service:store`, as it has already been resolved.

The fix is to unregister before registering again.

Fixes emberjs/ember.js#10310.

---

Please note, this is already a non-issue in 2.0.0 (aka release branch). This PR is targeting the release-1-13 branch (which was branched from the v1.13.11 tag).

[bmac]

@rwjblue In the 2.0 branch the initializer is using has to check if the store is already registered. Which I suspect is the reason this is not an issue with the 2.0 branch. Could this lead to some subtle sate bugs in 2.0 if an old store is not unregistered when calling App.reset()?

data/packages/ember-data/lib/initializers/store.js

Lines 37 to 39 in 5251766

	if (!has(registry, 'service:store')) {
	registry.register('service:store', Store);
	}

[rwjblue]

I am unsure, but it seems possible. I'll try to get us some tests here so we can confirm.