Comment # 1 on bug 1216814 from Thorsten Kukuk

(In reply to Petr Vorel from comment #0)
> I'm not sure if NetworkManager or wicked use /sbin/dhclient-script

Nobody is using it, it's unsupported:

# Note:
#   It is used by sysconfig alias netcontrol alias ifup-dhcp,
#   but not by the NetworkManager that is using an own script.
#
#   Wicked is using an another dhcp client (runtime conflict).
#   As sysconfig-network is gone on sles12 and opensuse > 13.1,
#   this script is obsolete and unsupported.


> but if we ship it, it should work.

We should not ship scripts which are obsolete, unsupported and unused by our
stack.
So it should be removed from dhcp-client package.

> i.e. we should add dependency to sysvinit-tools, which contains usleep.

This will not pass any review, as sysvinit-tools is clearly deprecated.