Fix for issue 754

Renamed "nova.comf" to "nova.conf" in configuration file list.
Merge pull request #374 from cloudnull/issue754

Merged automatically by jenkins after successful build test
Add HA bits for OS metadata service
Merge pull request #375 from rackerjoe/nova-api-metadata

Merged automatically by jenkins after successful build test
Enable block_migration_flag

Cherry-picking commits from
https://github.com/gapinc/nova/commit/ee57e7b0dc2066bf81fcaf3f3d4bff141cb82591
add a flag for config_drive_format, default to iso9660
Make scheduler_host_subset_size configurable.

Default value 1 is nova default.
Merge pull request #381 from rackerjoe/gap-block-migration

Merged automatically by jenkins after successful build test
Merge pull request #383 from rackerjoe/gap-config-drive-format

Merged automatically by jenkins after successful build test
Merge pull request #384 from gapinc/scheduler_host_subset_size

Merged automatically by jenkins after successful build test
default libvirt injection part to -2
Merge pull request #395 from jrcloud/GH813

Merged automatically by jenkins after successful build test
Enable send_arp_for_ha_count in nova.conf

- Add attribute for send_arp_for_ha_count in nova conf provider to match
  functionality in quantum/neutron l3_agent.ini

See https://github.com/rcbops/chef-cookbooks/issues/877
Merge pull request #398 from claco/issue-877

Merged automatically by jenkins after successful build test