dns: incompatibility with the way kresd >= 5.0.0 is configured

Current TOS 3.x and 5.x use different path for the control socket. We need to replace /tmp/kresd/tty/ by /tmp/kresd/control/ in file modules/*dns.module.

I'm confused by versions in this repo – both TOS 3.x and 5.x are version 11.6, but that doesn't seem close to any branch here... so I'm not submitting these trivial patches and leaving it to you (the Turris team). /cc @jpavlinec I guess?

Edited by Vladimír Čunát
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