dhcp: fixed denial of service via regular expressions

ISC DHCP was updated to ISC dhcp-4.2.5-P1 release, which contains updated
bind-9.8.4-P2 sources with removed regex.h check in configure
(bnc#811934, CVE-2013-2266).

Also:
Changed spec make the bind export library build output visible.
Added dhcp6-server service template for SuSEfirewall2 (bnc#783002)
Update config.guess/sub for aarch64

Fixed bugs
bnc#783002
Standard firewall blocks IPv6 UDP ports 546 and 5353
bnc#811934
VUL-0: CVE-2013-2266: dhcp: DHCP 4.2.5-P1 update to fix one security issue
Selected Binaries
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