Add new config option to be read single_instance_display_name_template, allow use of project_id and project_name in both name_templates, change conditional if based on instance count requested

Change-Id: I43408cc5e9f4f58b4600eeac0bbf311d2cea5213
Merge branch 'NOVA-ALLOW_VM_NAME_TO_USE_PROJECT_NAME_OR_ID' of https://github.com/alex-leonhardt/nova into NOVA-ALLOW_VM_NAME_TO_USE_PROJECT_NAME_OR_ID