Update bind to version 9.16.19 / rev 170 via SR 909191
    
    https://build.opensuse.org/request/show/909191
    by user jmoellers + dimstar_suse
    - Update to 9.16.19
      * A race condition could occur where two threads were
        competing for the same set of key file locks, leading to
        a deadlock. This has been fixed. [GL #2786]
      * create_keydata() created an invalid placeholder keydata
        record upon a refresh failure, which prevented the
        database of managed keys from subsequently being read
        back. This has been fixed. [GL #2686]
      * KASP support was extended with the "check DS" feature.
        Zones with "dnssec-policy" and "parental-agents"
        configured now check for DS presence and can perform
        automatic KSK rollovers. [GL #1126]
      * Rescheduling a setnsec3param() task when a zone failed
        to load on startup caused a hang on shutdown. This has
        been fixed. [GL #2791]
      * The configuration-checking code failed to a