Description of problem: There is " Select All" in cluster creation wizard at "Select Hosts" page. I think there can be also "Unselect All". Version-Release number of selected component (if applicable): ceph-ansible-1.0.5-31.el7scon.noarch ceph-installer-1.0.14-1.el7scon.noarch rhscon-ceph-0.0.34-1.el7scon.x86_64 rhscon-core-0.0.35-1.el7scon.x86_64 rhscon-core-selinux-0.0.35-1.el7scon.noarch rhscon-ui-0.0.49-1.el7scon.noarch
if possible the button text should update dynamically to the appropriate value (no need for another button)