Fix unchecked nil for network_ids config item. Clean up definition of server_def.
Fix unchecked nil for network_ids config item. Clean up definition of
server_def.

Conflicts:
	lib/chef/knife/openstack_server_create.rb

david-crowder/knife-openstack,chef/knife-openstack,chef/knife-openstack,BobbyRyterski/knife-openstack