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Ticket: CM-10857 Reviewed By: julien, nikhil Testing Done: Tested moving from a static to dhcp addr method for eth0 the check to see if dhclient is running on an interface was failing. which caused the following problem: - interface when moved from dhcp to static addr_method was not killing the existing dhcp process - and a subsequent move from static to dhcp addr_method quit starting dhcp because a dhclient process was already running - but the original dhcp ip was already removed because of the static address config which leaves eth0 in a weird state After this patch: - move from dhcp to static addr_method will release any existing dhcp leases on an interface - a subsequent move from static to dhcp will request a new dhcp lease Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>