B #147: Drop DNS conf. from Debian's interfaces

Dropped to align behaviour with other systems, where DNS configuration
is done through loc-11-dns. We should review this functionality later
once again to check if we can leave the DNS configureation on purely on
networking scripts everywhere....

Closes #147

src/etc/one-context.d/loc-10-network##deb.one

@@ -100,32 +100,6 @@ get_iface_var() {
     echo $var
 }
 
-export DNS_VARIABLES="DNS $(env | sed 's/=.*$//' | grep -E '^ETH[0-9]+_DNS$' | sort)"
-
-export SEARCH_VARIABLES="SEARCH_DOMAIN $(env | sed 's/=.*$//' | grep -E '^ETH[0-9]+_SEARCH_DOMAIN$' | sort)"
-
-nameservers=$(
-    dns=()
-    for var in ${DNS_VARIABLES}; do
-        value=$(eval "echo \"\${$var}\"")
-        if [ -n "$value" ]; then
-             dns+=("$value")
-        fi
-    done
-    echo $(printf " %s" "${dns[@]}")
-)
-
-searchdomains=$(
-    search=()
-    for var in ${SEARCH_VARIABLES}; do
-        value=$(eval "echo \"\${$var}\"")
-        if [ -n "$value" ]; then
-            search+=("$value")
-        fi
-    done
-    echo $(printf " %s" "${search[@]}")
-)
-
 gen_iface_conf() {
     cat <<EOT
 iface $DEV inet static
@@ -141,16 +115,6 @@ EOT
     if [ -n "$GATEWAY" ]; then
         echo "  gateway $GATEWAY"
     fi
-    #only for first interface
-    if [ "eth0" == $DEV ]; then
-        if [ -n "$nameservers" ]; then
-            echo "  dns-nameservers $nameservers"
-        fi
-
-        if [ -n "$searchdomains" ]; then
-            echo "  dns-search $searchdomains"
-        fi
-    fi
     echo ""
 }