use wgctrl lib instead of wrapping wg-tools

fixes: #3

tests/wg

@@ -1,18 +0,0 @@
-#!/bin/sh
-
-case $1 in
-    '')
-        echo "nothing to see here"
-        ;;
-    genkey)
-        echo "ILICZ3yBMCGAWNIq5Pn0bewBVimW3Q2yRVJ/Be+b1Uc="
-        ;;
-    pubkey)
-        read x
-        echo "VceweY6x/QdGXEQ6frXrSd8CwUAInUmqIc6G/qi8FHo="
-        ;;
-    *)
-        echo "what?"
-        exit 1
-        ;;
-esac

tests/wg-quick

@@ -1,14 +0,0 @@
-#!/bin/sh
-
-case $1 in
-    up)
-        echo "up $2"
-        ;;
-    pubkey)
-        echo "down $2"
-        ;;
-    *)
-        echo "what?"
-        exit 1
-        ;;
-esac