pdnsd-1.2.9a-bp156.5.7

- Added hardening to systemd service(s) (bsc#1181400). Modified:
  * pdnsd.service

- add pdnsd-net_if_h-vs-linux_if_h.patch to fix Factory build
- add a locally tested collection of patches:
  * pdnsd-06_reproducible_build.patch for reproducible build
  * pdnsd-fix-udppacketsize.diff fixing an invalid UDP response
    packet truncation encountered in the wild

- Do not ignore errors from groupadd.
- Convert sysvinit script to systemd service unit. [boo#1116030]

- Add %insserv_prereq PreReq: since we still install legacy initd
  services it is our own duty to ensure the legacy tools to handle
  them are installed.

- make init script executable, fix build

- Changes file was fixed up in according to sr's #175639 & #175789.
- Switched from user nobody to pdns to correspond Factory rules.

- Branched from home:Reki.
- Updated from 1.2.9 to 1.2.9a.
- Spec-file was completely fixed up.