Security update for pdns-recursor (moderate)

This update for pdns-recursor to version 4.1.8 fixes the following issues:

Security issues fixed:

• CVE-2018-10851: Fixed denial of service via crafted zone record or
  crafted answer (bsc#1114157).
• CVE-2018-14644: Fixed denial of service via crafted query for meta-types
  (bsc#1114170).
• CVE-2018-14626: Fixed packet cache pollution via crafted query
  (bsc#1114169).
• CVE-2018-16855: Fixed case where a crafted query could cause a denial of
  service (bsc#1116592)

Non-security issues fixed:

• Fixed build failure with Boost 1.67.0 (bsc#1089814).
• Revert ‘Keep the EDNS status of a server on FormErr with EDNS’
• Refuse queries for all meta-types

For more details about this update, refer to:
<a href=“https://blog.powerdns.com/2018/11/26/powerdns-recursor-4-1-8-released/”>https://blog.powerdns.com/2018/11/26/powerdns-recursor-4-1-8-released/</a>