Add support for storage.conf and storage-config.5.md from github container storage package

Bump to the latest version of skopeo
vendor.conf: add ostree-go
      it is used by containers/image for pulling images to the OSTree storage.
fail early when image os does not match host os
Improve documentation on what to do with containers/image failures in test-skopeo
  We now have the docker-archive: transport
  Integration tests with built registries also exist
Support /etc/docker/certs.d
update image-spec to v1.0.0-rc6

.gitignore

@@ -13,3 +13,4 @@
 /skopeo-0224d8c.tar.gz
 /skopeo-e802625.tar.gz
 /skopeo-0b73154.tar.gz
+/skopeo-d5e34c1.tar.gz

skopeo.spec

@@ -25,7 +25,7 @@
 # https://github.com/projectatomic/skopeo
 %global provider_prefix %{provider}.%{provider_tld}/%{project}/%{repo}
 %global import_path     %{provider_prefix}
-%global commit          0b7315460126b8945fd53f9318a65d7cc8796af1
+%global commit          d5e34c1b5e1635c9d4ca2c45c240c78f2b26d395
 %global shortcommit     %(c=%{commit}; echo ${c:0:7})
 
 # e.g. el6 has ppc64 arch without gcc-go, so EA tag is required

sources

@@ -1 +1,2 @@
 SHA512 (skopeo-0b73154.tar.gz) = 6632f2b495c983a2c2ee6581ecf32fc5935e4c9b2cc4bf5789264356a7fd53e93d834c3b8debf7f6036d2ed832613fcefca34f79623842b3b61ad83bc81fe0ac
+SHA512 (skopeo-d5e34c1.tar.gz) = cf8a1a0e155429c24662608ac6618bd7746aef9262c36a1b0550665fa79bca79025b45fb55defab963993bae5783f2c7d9a63d5dd4ef7e5ae75d06ea208ecd7f