* 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
* Separate Access Config from yandex builder Config
* make use of Access Config explicit
* Move `MaxRetries` into AccessConfig
* NewDriverYC use AccessConfig instead Config
* yandex-import PP use common Access Config
Now support set custom API Endpoint
* yandex-export PP use common Access Config
Now support set custom API Endpoint too (as yandex-import)
* fix test
* Tiny doc updates.