Integration test case for images

Implement Integration Test for images panel:
horizon/openstack_dashboard/test/integration_tests/tests/test_images.py

Integration Testing data:
horizon/openstack_dashboard/test/integration_tests/horizon.conf

Integration Test case for Images panel:
0:open firefox
1:demo user login
2:go to project dashboard
3:go to Images panel
4:click create images and set image testing data
5:check that image was created successfully
6:delete the images just created
7:demo logout
8:close firefox

Work items:
1:horizon.openstack_dashboard.test.integration_tests.pages.image.py