Support Ember Auto Import without requiring manual configuration

Ember Auto Import is a default dependency of new Ember applications and addons. It violates default CSP by default. Its configuration must be adjusted manually to be compatible with Ember CLI Content Security Policy. It is documented both in [our documentation](https://github.com/rwjblue/ember-cli-content-security-policy#ember-auto-import) as well as in [Ember Auto Import's documentation](https://github.com/ef4/ember-auto-import#i-use-content-security-policy-csp-and-it-breaks-ember-auto-import). While that documentation helps new adopters to resolve the issue it's still a terrible developer experience. We should provide compatibility out of the box.

Ember Auto Import is uninstalled in the test suite to not cause tests to fail. As soon as both addons are compatible by default this code should be removed. After that point the existing tests will also provide regression tests that a new project does not violate the default CSP. https://github.com/rwjblue/ember-cli-content-security-policy/blob/8c4067ada6c8a0a93106d0a2e08acd5c490329bd/node-tests/e2e/test-support-test.js#L25-L36