lsh: make sure we actually _evaluate_ the command line

This makes it possible to do things like `lsh "echo \$MOONBASE"`
Merge pull request #33 from v4hn/lsh-eval

lsh: make sure we actually _evaluate_ the command line
Replace the use of net-tools with iproute
Updated sustained list to reflect net-tools -> iproute2
Merge pull request #35 from Ratler/remove_ifconfig

Replace the use of net-tools with iproute
Remove unnecessary use of grep
Version 6
Also account for bridge devices
Version 7