Use a separate resolver to resolve TSig secrets instead of a map

This deprecates the old TsigSecret, but adds a small shim for backward
compatability.

Signed-off-by: Arthur Skowronek <ags@digineo.de>
Signed-off-by: Dominik Menke <dom@digineo.de>
Co-Authored-by: Dominik Menke <dom@digineo.de>

Release 1.1.30

Release 1.1.29

Release 1.1.28

Release 1.1.27

Release 1.1.26

Release 1.1.25

Release 1.1.24

Release 1.1.23

Release 1.1.22