Add SOCKETIO_HOST to test_settings for views_tests

Subsequent to commit d020c87's addition of SOCKETIO_HOST to the DashboardView's context, tests in views_tests failed due to the AttributeErrors that were raised when they tried to import this setting from the test environment.
Merge pull request #1 from reduxionist/test_settings-SOCKETIO_HOST

Add SOCKETIO_HOST to test_settings for views_tests