main/bind: depend on bind-tools

The install script needs to call rndc-confgen to generate a key which is
required for reloading to work.

955e3791 (main/bind: add support for "reload", 2019-10-19) added
support for reload, but that causes an issues when installing bind,
because rndc-confgen is in the bind-tools subpackage, which is not
available if you just install bind.

Fix this by having bind depend on bind-tools.

Fixes #10935
7 jobs for !1076 with fix-bind in 8 minutes and 24 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Lint
failed #11439
docker-alpine x86_64 allowed to fail
lint

00:00:20

 
  Build
passed #11444
docker-alpine ci-build aarch64
build-aarch64

00:07:28

passed #11445
docker-alpine ci-build armv7
build-armv7

00:07:51

passed #11443
docker-alpine ci-build ppc64le
build-ppc64le

00:08:02

passed #11442
docker-alpine ci-build s390x
build-s390x

00:05:11

passed #11441
docker-alpine ci-build x86
build-x86

00:05:55

passed #11440
docker-alpine ci-build x86_64
build-x86_64

00:05:14

 
Name Stage Failure
failed
lint Lint
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