* start using `go:generate packer-sdc struct-markdown`
* Update Makefile
remove @go install ./cmd/struct-markdown
* run go generate for struct-markdown
* use //go:generate packer-sdc mapstructure-to-hcl2
* run go generate for mapstructure-to-hcl2
* remove struct-markdown and mapstructure-to-hcl2
* vendor vendors
Remove usage of the deprecated OpenStack Compute service floating IP
management and add methods to work with the OpenStack Networking
service floating IPs API.
Remove usage of the deprecated OpenStack Compute service floating IP
pools and add methods to work with the OpenStack Networking service
external networks API.
Move reusable logic of working with the OpenStack Networking service API
to a separate methods in the networking.go file.
Pass error messages from the API services to the ui messages in the
allocate IP step.
This commit allows user to use the Block Storage v3 volume as the
Compute instance root volume.
Also it adds new volume-related parameters to the builder.
When AUTH_URL and each endpoints need SSL client authentication, we
have to specify cert file and private key file.
So, add optional config, cert and key.