main/bind: depend on bind-tools

Merged Kevin Daudt requested to merge kdaudt/aports:fix-bind into master

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.

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