Add some verify in test_create_ebs_image_and_check_boot
Add some verify in test_create_ebs_image_and_check_boot

When boot instance from EBS image,add some verify to
make sure the server was created from the image.

Change-Id: Ibf4fa2df311468a07ab0aa7be4245f1c480f3d8e

cisco-openstack/tempest,openstack/tempest,masayukig/tempest,masayukig/tempest,cisco-openstack/tempest,openstack/tempest