Merge pull request #92 from tsaikd/kd-fix-syntax

fix invalid sh syntax
Update README to not suggest an lxc dependency

When reading the readme, the impression was that Pipework required LXC.  This edit tries to remove that impression, and give a little detail of what pipework is built on.
Merge pull request #93 from hugoduncan/patch-1

Update README to not suggest an lxc dependency
add some test for reset network from host to prevent crash
kill dhclient after get ip address to prevent device be used after container close
Merge remote-tracking branch 'origin/kd-nocrash'