Fix minor typo to name and port range

Typo on the name of the FaceTime shape rule, and missing 1 from Google
Talk port range.
Some device names are bigger now (eg vtnet, ixgbe, cxgbe)
find_dhclient_process() returns an int, not string
Implement a function to kill dhclient process, sometimes it takes a little time to die, so use a sleep(1) there
Make sure dhclient is not running before start it, it fixes console interface setup when interface is using dhcpv4. It should also help #3482
Merge pull request #1273 from fsSnowboard/master