Remove two unused nova tasks
Remove two unused nova tasks

ServerConsoleGet and NovaImageList were both used but still in the file.

Change-Id: I91a609b241eed497842a2a28ed41d2b1205913ca

openstack-infra/shade,dtroyer/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,openstack-infra/shade,openstack/python-openstacksdk,stackforge/python-openstacksdk,openstack/python-openstacksdk