As long as the alphabetically first host had numa support, the "Numa Pinning" pinning button was not greyed out.
It was possible to do numa pinning on hosts with just one numa node (which is the equivalent of no numa architecture) but saving the pinning failed because of correct backend validations. Backend validation was fixed in https://bugzilla.redhat.com/show_bug.cgi?id=1279178
Correctly detect in the UI if the currently selected host supports NUMA.
Greys out all numa related boxes and buttons in the UI when a host without numa support is selected.