Upstream version 9.11.2.P1

# gpg: Signature made Wed 17 Jan 2018 06:03:12 AM UTC
# gpg:                using RSA key C361B1E3029543EBC625E97D8372A477EFAE59C2
# gpg: Good signature from "Ondřej Surý <ondrej@sury.org>" [ultimate]
# gpg:                 aka "Ondřej Surý <ondrej@debian.org>" [ultimate]
# gpg:                 aka "Ondřej Surý <ondrej@isc.org>" [ultimate]
# Primary key fingerprint: 30B9 33D8 0FCE 3D98 1A2D  38FB 0C99 B70E F4FC BB07
#      Subkey fingerprint: C361 B1E3 0295 43EB C625  E97D 8372 A477 EFAE 59C2

The previous version of d/rules included lot of custom install commands,
this has now been moved to bind9.install and bind9-doc.install and all
the extra files has been moved to d/extra/ to declutter the main directory.

Closes: #883228

Closes: #882999

Drop all explicit build-deps and command line options that are now default

Fixes postinst error on non-systemd systems

Closes: #883575

This regression was introduced in 3e1f232b,
revert to old behaviour for now.

Closes: #883536

Closes: #883449

Closes: #883448

Closes: #883159