dhclient pretty escape and string option checks. Use relaxed
domain-name option check causing a regression, when the server
is misusing it to provide a domain list and does not provide
it via the domain-search option; pretty escape semicolon as well
(bnc#675052, CVE-2011-0997).
OBS-URL: https://build.opensuse.org/package/show/network:dhcp/dhcp?expand=0&rev=64
