Definitely looks to be missing on CentOS 7 servers. I have checked a handful. Any testing CentOS 7 servers on your end you could check this on?
CT-23156-bash-4.2# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
CT-23156-bash-4.2# /usr/local/cpanel/cpanel -V
54.0 (build 16)
CT-23156-bash-4.2# ls -la /scripts/ | grep kill
-rwxr-xr-x 1 root root 716 Jan 27 01:04 ckillall
-rwxr-xr-x 1 root root 1890 Jan 27 01:04 kill_broken_attracta_hooks
-rwxr-xr-x 1 root root 2294 Jan 27 01:04 killdns
-rwxr-xr-x 1 root root 1136 Jan 27 01:04 killdns-dnsadmin
-rwxr-xr-x 1 root root 1330 Jan 27 01:04 killdrrootvhost
-rwxr-xr-x 1 root root 457 Jan 27 01:04 killmysqluserprivs
-rwxr-xr-x 1 root root 1208 Jan 27 01:04 killmysqlwildcard
-rwxr-xr-x 1 root root 2142 Jan 27 01:04 killpvhost
-rwxr-xr-x 1 root root 814 Jan 27 01:04 killspamkeys
-rwxr-xr-x 1 root root 1649 Jan 27 01:04 killsslvhost
-rwxr-xr-x 1 root root 1733 Jan 27 01:04 killvhost