delete .files like .gitignore from vendored content

[imikushin]

No description provided.

[silasdavis]

trash might actually be the answer to my vendoring woes, so thanks for that. It seems that all top-level go files get captured. Would be nice to avoid. For example:

	vendor/github.com/docker/docker/.dockerignore
	vendor/github.com/docker/docker/.gitignore
	vendor/github.com/docker/docker/.mailmap
	vendor/github.com/docker/docker/AUTHORS
	vendor/github.com/docker/docker/CHANGELOG.md
	vendor/github.com/docker/docker/CONTRIBUTING.md
	vendor/github.com/docker/docker/Dockerfile
	vendor/github.com/docker/docker/Dockerfile.aarch64
	vendor/github.com/docker/docker/Dockerfile.armhf
	vendor/github.com/docker/docker/Dockerfile.ppc64le
	vendor/github.com/docker/docker/Dockerfile.s390x
	vendor/github.com/docker/docker/Dockerfile.simple
	vendor/github.com/docker/docker/Dockerfile.solaris
	vendor/github.com/docker/docker/Dockerfile.windows
	vendor/github.com/docker/docker/MAINTAINERS
	vendor/github.com/docker/docker/Makefile
	vendor/github.com/docker/docker/README.md
	vendor/github.com/docker/docker/ROADMAP.md
	vendor/github.com/docker/docker/VENDORING.md
	vendor/github.com/docker/docker/VERSION
	vendor/github.com/docker/docker/api/README.md
	vendor/github.com/docker/docker/api/swagger-gen.yaml
	vendor/github.com/docker/docker/api/swagger.yaml
	vendor/github.com/docker/docker/pkg/README.md
	vendor/github.com/docker/docker/poule.yml
	vendor/github.com/docker/docker/vendor.conf