This update for docker-distribution fixes the following issues:

- Enable build on %arm (which include armv6), not only on armv7

- Enable ppc64le

- Use correct URL to project
- Remove fillup, we don't ship a sysconfig file
- Correct systemd requires
- Enable build on ARM

- Upgraded to 2.7.1
  - Support for OCI images added
  - Fix upgrade issues from 2.6.x
  - Update Go version to 1.11
  - Switch to multi-stage Dockerfile
  - Validations enabled by default with new disabled config option
  - Optimize health check performance
  - Create separate permission for deleting objects in a repo
  - Fix storage driver error propagation for manifest GETs
  - Fix forwarded header resolution
  - Add prometheus metrics
  - Disable schema1 manifest by default
  - Graceful shutdown
  - TLS: remove ciphers that do not support perfect forward secrecy
  - Fix registry stripping newlines from manifests
  - Add bugsnag logrus hook
  - Support ARM builds

  This release is a special security release to address an issue allowing
  an attacker to force arbitrarily-sized memory allocations in a registry
  instance through the manifest endpoint. The problem has been mitigated
  by limiting the size of reads for image manifest content.
  Details for mitigation are in 29fa466
  Fixes boo#1049850 (CVE-2017-11468)
  Fixes boo#1033172