Allows the client to choose the context to finish the lease.
This allows the client to switch contexts when the main context
used to the create the lease may have been cancelled.
Signed-off-by: Derek McGowan <derek@mcgstyle.net>
Preserves the order of the tree output between each execution. Slightly
refactored the behavior to be more "object oriented".
Signed-off-by: Stephen J Day <stephen.day@docker.com>
