a lot of cinder smoketests with description

First of all let me remind you that almost all tests in file mentioned above can be implemented with tempest, except ssh tests (due to tempest functionality limitations we are unable to use ssh keys for conducting ssh-based tests on vm instances and  due to libvirt problems we can't use ssh passwords too). That's why smoketests were written as separated bash scripts, and our goal is to develop a set of smoketests which will cover with tests all core functions needed for cinder.