Update nova flagmappings for libvirt group

Updated Nova flag mappings to reflect that libvirt specific flags are
moving to a "libvirt" group. This will take effect in the output when
the autoconfig tables are next generated.

Change-Id: Ia5e13ba6cc5678098018678edcc79ef91f31aca6
Closes-Bug: #1253822

autogenerate-config-docs/flagmappings/nova.flagmappings

@@ -46,8 +46,8 @@ cert upgrade_levels
 cert_file ca
 cert_manager ca
 cert_topic ca
-checksum_base_images hypervisor
-checksum_interval_seconds compute
+checksum_base_images libvirt
+checksum_interval_seconds libvirt
 cinder_api_insecure volumes
 cinder_ca_certificates_file volumes
 cinder_catalog_info volumes
@@ -194,14 +194,14 @@ idle_timeout db
 image_cache_manager_interval compute
 host_password vmware
 image_decryption_dir s3
-image_info_filename_pattern compute
+image_info_filename_pattern libvirt
 inject_password hypervisor
 injected_network_template network
 injected_network_template network
 instance_build_timeout compute
 instance_delete_interval compute
 instance_dns_domain network
-instance_dns_manager network 
+instance_dns_manager network
 instance_format logging
 instance_name_template api
 instance_type_extra_specs baremetal
@@ -439,10 +439,10 @@ reclaim_instance_interval compute
 recv_timeout zookeeper
 region_list ec2
 registry_default_port docker
-remove_unused_base_images hypervisor
-remove_unused_kernels hypervisor
-remove_unused_original_minimum_age_seconds hypervisor
-remove_unused_resized_minimum_age_seconds hypervisor
+remove_unused_base_images libvirt
+remove_unused_kernels libvirt
+remove_unused_original_minimum_age_seconds libvirt
+remove_unused_resized_minimum_age_seconds libvirt
 report_interval common
 rescue_image_id hypervisor
 rescue_kernel_id hypervisor