Add a reload_config function to the DaemonApiMixin
Add a reload_config function to the DaemonApiMixin

This allows the client to reload the config.json for an existing
APIClient instance.

Signed-off-by: Erik Johnson <43d4bedced1af4597739798c38c6ae5eac3c296e@gmail.com>

vdemeester/docker-py,dimaspivak/docker-py,youhong316/docker-py,vpetersson/docker-py,dimaspivak/docker-py,funkyfuture/docker-py,docker/docker-py,kaiyou/docker-py,funkyfuture/docker-py,vpetersson/docker-py,docker/docker-py,vdemeester/docker-py,youhong316/docker-py,kaiyou/docker-py