* if-up-scripts/check-gateway,if-up-scripts/check-network-cable,scripts/network-test:
  Make dash happy by declaring the local variables at the beginning of each
  function (Closes: #639889)
* if-up-scripts/check-network-cable:
   - Do not use ethtool or mii-tool if we are not running as root
* if-up-scripts/check-duplicate-ip,if-up-scripts/check-gateway,if-up-scripts/check-network-cable,scripts/network-test:
   Proper quoting of shell-escaped variables