fixes 6415 - ignore non-bootable distributions in content view
ignoring: a) as part of validation to not allow 2 dists with the same arch and version b) as part of calculating the kickstart url for a new host
fixes 6415 - ignore non-bootable distributions in content view
ignoring:
a) as part of validation to not allow 2 dists with the same arch and version
b) as part of calculating the kickstart url for a new host