* Bump github.com/klauspost/pgzip from 1.2.2 to 1.2.3
* Update import path for bbolt
* Bump github.com/sirupsen/logrus from 1.4.2 to 1.5.0
* Bump go.etcd.io/bbolt from 1.3.3 to 1.3.4
* Bump github.com/containers/storage from 1.16.5 to 1.16.6
* Move architecture+variant logic together, separate from wantedOS
* Only auto-detect platform variant if we are also auto-detecting the architecture
* Make restTLSClientConfig in restConfig a public field
* Add a comment to explain why tests are excluding the config descriptor
* Fix MIME type in expected results of schema1->schema2 conversion
* Rename image/fixtures/schema1-to-oci-config.json to schema1-for-oci-config.json
* Add ManifestUpdateInformation to tests converting from schema1
* Add tests for conversion between schema1 and OCI
* Consolidate repeated uses of GzippedEmptyLayerDigest to a single local variable
* Allow manifestConvertFn to edit ManifestUpdateOptions
* Modify manifestConvertFn to return a genericManifest instead of Image
* Convert ManifestUpdateOptions.LayerInfos on conversions from/to schema1
