1092754: 1094879: Remove install-num-migrate-to-rhsm tool

Remove 'install-num*' special case in make stylish
Update README.Fedora to remove ref to
install-num-migrate-to-rhsm.
Merge pull request #951 from candlepin/ckozak/remove_num_migrate

1092754: 1094879: Remove install-num-migrate-to-rhsm tool